Went after fresh detail (6)
I believe the answer is:
tailed
'went after' is the definition.
('tail' can be a synonym of 'go after')
'fresh detail' is the wordplay.
'fresh' indicates an anagram (a fresh re-ordering of the letters).
'detail' anagrammed gives 'TAILED'.
(Other definitions for tailed that I've seen before include "Followed like rear appendage" , "In slang, followed like private detective" , "Followed (suspect)" , "Followed by private detective, having rear appendage" , "Followed, tracked" .)