Crossword Genius

Experts at cracking a case? (4)

Ross

I believe the answer is:

aces

'experts' is the definition.
(ace is a kind of expert)

'cracking a case?' is the wordplay.
'cracking' is an anagram indicator.
'case' is an anagram of 'ACES'.

'at' is the link.

(Other definitions for aces that I've seen before include "never come back" , "Case of top cards" , "excellent service" , "Flying war heroes" , "Expert fliers" .)

I've seen this clue in the Evening Standard.
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