Ok my review
1. Yes the clock is inneed a bell whoever actually stays in the room presess the switch in the room when she wants something or want someone to tend to her needs . It is a call tht someone is needed that's why maid and trilok rushes when they hear the clock. suhana seems to be a afraid of whoever is residing there. May be she feels that the person will come out and hence goes and hugs trilok ya kalayni on hearing the sound.
2. Revenge is probably against malhar but i think kalayni will eventually be added to it as that old woman warns kalayni and not malhar about everything.
3. Note the dialogue : iss baar mei jeethunga ye pata tha but itna aasan tha nahi pata tha . My lord note the point iss bar which means it is not the first attempt he has been trying to defeat malhar for long time which inneed indicates his previous failed attempts.
So 99.999% chances he ki he is the creator of entire drama
Starting from rachit naxal pillu illness sampada and ivf tak.
Remember kallu kidnap and malhar attempt to kill cm the voice over said malhar to remember what he did pastnd the. Mamta also said na the naxal have a 3rd maksath that ahir doent know . It will come out as time comes.
4. About as chameleon he pata hena iss bakth Anu is free from jail she is happy with sarthak so no motive to avenge. And yes Atharva se malhar ne hi bachaya unhe barna car mei dum ghutke marthi. Kallu ka bhi mauth hothi. Pillus life daav pe tha but still he saved kallu by abortion . So as of now malhar is good for her . But kabhi bhi palat sakthe he.
4. About the girl clinging on to malhar is just a cameo or junior artist for a day belive not a charechter or cameo
She can be either of
A plot by maai and kaka to make kallu jealous and take some step
Or
Plot by trilok to prove that malhar is not of good charechter infront of kalayni so that it can increase the wedge between kalma
Why I say this beacuse precap malhar itself says this is the punishment for not trusting my charechter which means she understood that she was wrong about the girl.