Rewarding son with any gift is wrong (10)
I believe the answer is:
satisfying
'rewarding' is the definition.
('satisfying' can be similar in meaning to 'rewarding')
'son with any gift is wrong' is the wordplay.
'son' becomes 's'.
'with' says to put letters next to each other.
'wrong' is an anagram indicator.
'any'+'gift'+'is'='anygiftis'
'anygiftis' with letters rearranged gives 'atisfying'.
's'+'atisfying'='SATISFYING'
(Other definitions for satisfying that I've seen before include "Meeting (requirements)" , "Cool" , "Meeting (needs, etc)" , "Fulfilling (a need)" , "enough?" .)