Nicked, sweep finally going over discombobulated fielder (8)
I believe the answer is:
pilfered
'nicked' is the definition.
(both can mean stolen)
'sweep finally going over discombobulated fielder' is the wordplay.
'finally' indicates one should take the final letters.
'going over' is a charade indicator (letters next to each other).
'discombobulated' indicates an anagram.
The final letter of 'sweep' is 'p'.
'fielder' is an anagram of 'ilfered'.
'p'+'ilfered'='PILFERED'
(Other definitions for pilfered that I've seen before include "Stole in small amounts" , "Filched" , "taken" .)