Track what's wrong in earnings (7)
I believe the answer is:
pathway
'track' is the definition.
(thesaurus)
'what's wrong in earnings' is the wordplay.
'wrong' is an anagram indicator.
'in' is an insertion indicator.
'earnings' becomes 'pay' (synonyms).
'what' with letters rearranged gives 'athw'.
'athw' going into 'pay' is 'PATHWAY'.
(Other definitions for pathway that I've seen before include "route? ..." , "A trodden track" , "Walking track" .)