Indifferent answer, sorry (9)
I believe the answer is:
apathetic
'indifferent' is the definition.
(synonyms)
'answer sorry' is the wordplay.
I cannot really see how this works, but
'answer' could be 'a' (abbreviation eg in Q and A) and 'a' is present in the answer.
The remaining letters 'pathetic' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for apathetic that I've seen before include "past caring?" , "showing no enthusiasm" , "Showing no emotion or interest" , "Unenthusiastic" , "Lacking passion" .)