Contrary lawyer calling for confession (9)
I believe the answer is:
admission
'confession' is the definition.
(I've seen this before)
'contrary lawyer calling' is the wordplay.
'contrary' says the letters should be written in reverse.
'lawyer' becomes 'da' (abbreviation for District Attorney).
'calling' becomes 'mission' (calling can mean a mission or vocation in life).
'da' written backwards gives 'ad'.
'ad'+'mission'='ADMISSION'
'for' is the link.
(Other definitions for admission that I've seen before include "A confessing" , "Acknowledgment of the truth of something" , "Access" , "Anything conceded" , "Acknowledge of the truth of something" .)