Found out a lender is crooked (7)
I believe the answer is:
learned
'found out' is the definition.
('learn' can be a synonym of 'find out')
'a lender is crooked' is the wordplay.
'is crooked' is an anagram indicator.
'a'+'lender'='alender'
'alender' with letters rearranged gives 'LEARNED'.
(Other definitions for learned that I've seen before include "Discovered - erudite" , "Well-educated" , "Literati" , "Wise, educated" , "Intellectual" .)