Crazy shot gaining trophy (8)
I believe the answer is:
crackpot
'crazy' is the definition.
(thesaurus)
'shot gaining trophy' is the wordplay.
'shot' becomes 'crack' (crack shot is a kind of shot**).
'gaining' says to put letters next to each other.
'trophy' becomes 'pot' (I've seen this before).
'crack'+'pot'='CRACKPOT'
(Other definitions for crackpot that I've seen before include "Bats" , "Damage utensil for informally eccentric person" , "Crank" , "Eccentric; impractical" , "crazy type" .)