Reward lad holding broken nut (6)
I believe the answer is:
bounty
'reward' is the definition.
(bounty is a kind of reward)
'lad holding broken nut' is the wordplay.
'lad' becomes 'boy' (I've seen this before**).
'holding' indicates putting letters inside.
'broken' is an anagram indicator.
'nut' with letters rearranged gives 'unt'.
'boy' placed around 'unt' is 'BOUNTY'.
(Other definitions for bounty that I've seen before include "Premium" , "Generosity; reward" , "more than one of 16 [MUTINEER] took to Tahiti?" , "The price on one's head?" , "Reward on head of criminal" .)