The father was exiled from Spain for wrongdoing (3)
I believe the answer is:
sin
'wrongdoing' is the definition.
(sin is a kind of wrongdoing)
'the father was exiled from spain' is the wordplay.
I cannot quite see how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is found within the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...
'for' acts as a link.
Can you help me to learn more?
(Other definitions for sin that I've seen before include "Wickedness" , "Breach of morality" , "Moral offence" , "Transgress" , "Wicked deed" .)