Baker worn out under pressure becomes moneylender (10)
I believe the answer is:
pawnbroker
'moneylender' is the definition.
(thesaurus)
'baker worn out under pressure' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'under' means one lot of letters go next to another (below, in a down clue).
'pressure' becomes 'p' (abbreviation).
'baker'+'worn'='bakerworn'
'bakerworn' is an anagram of 'awnbroker'.
'awnbroker' after 'p' is 'PAWNBROKER'.
'becomes' acts as a link.
(Other definitions for pawnbroker that I've seen before include "His sign is three balls" , "Uncle's" , "One lending against deposited goods" , "Uncle" , "shopkeeper" .)