Bound to be very soft hearted when given cash (6)
I believe the answer is:
tipped
'given cash' is the definition.
'tipped' can be an answer for 'given' (tipping is a kind of giving). I am not certain of the 'cash' bit.
'bound to be very soft hearted' is the wordplay.
I cannot really understand how this works, but
'soft' could be 'pp' (musical abbreviation for pianissimo) and 'pp' is found within the answer.
'bound' could be 'tied' ('tie' can be a synonym of 'bind') and 'tied' is found within the leftover letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'when' is the link.
Can you help me to learn more?
(Other definitions for tipped that I've seen before include "Gave gratuity to or touched" , "Predicted to be a winner" , "Crowned" , "Given a gratuity" , "Gave reward (to waiter)" .)