Jailbird to attract disdain (8)
I believe the answer is:
contempt
'disdain' is the definition.
(synonyms)
'jailbird to attract' is the wordplay.
'jailbird' becomes 'con' (I've seen this in other clues).
'to attract' becomes 'tempt' (I've seen this in other clues).
'con'+'tempt'='CONTEMPT'
(Other definitions for contempt that I've seen before include "Open disrespect, to a court, say" , "Low opinion, sometimes of court" , "Offence of disrespect in court" , "Wilful disrespect of authority" , "Undisguised disrespect" .)