An answer you can depend on being soft-hearted? (5)

I believe the answer is:

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'an answer' is the definition.
(I know that answer can be written as reply)

'you can depend on being soft-hearted?' is the wordplay.
I cannot really see how this works, but
'on' could be 're' (regarding) and 're' is found in the answer.
'soft' could be 'p' (musical abbreviation for piano, 'soft') and 'p' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for reply that I've seen before include "response is demanded" , "acknowledgement" , "Counter" , "Comeback" , "Come back" .)

I've seen this clue in the Evening Standard.

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