[SPS-1]

It is condensation line for hvac. It was not dripping water before. Now it is.

Is it possible you were not running the AC before ? Now you are ?

 

[SPS-1]

It did not drip when cold ac was ON before.

Yes it was, you just didn't notice.
If the cold is working, it will produce condensation.

Could the clog be cleared from the drain line shown in photo?

What clog?
You wrote that water was coming out of the pipe --- that's what its supposed to do.
It would be a problem if water was NOT coming out of the condensate drain.