Fixed jailbird's meeting with good man, social worker (8)
I believe the answer is:
constant
'fixed' is the definition.
(thesaurus)
'jailbird's meeting with good man social worker' is the wordplay.
'jailbird' becomes 'con' (I've seen this in other clues).
'meeting' is a charade indicator (letters next to each other).
'with' means one lot of letters go next to another.
'good man' becomes 'st'.
'social worker' becomes 'ant' (I've seen this before).
'con'+'st'+'ant'='CONSTANT'
(Other definitions for constant that I've seen before include "Never-ending" , "Steady and unceasing" , "exactly as before" , "sustained" , "Endless" .)