New case for experts (4)
I believe the answer is:
aces
'experts' is the definition.
(ace is a kind of expert)
'new case' is the wordplay.
'new' indicates an anagram.
'case' is an anagram of 'ACES'.
'for' is the link.
(Other definitions for aces that I've seen before include "Playing cards with single pips on their faces" , "winning points" , "Winning serves" , "winning shots" , "Top cards or people" .)