Judas for one bitter, perhaps, about situation (7)
I believe the answer is:
apostle
'judas for one' is the definition.
(judas is a kind of Apostle)
'bitter perhaps about situation' is the wordplay.
'bitter perhaps' becomes 'ale'.
'about' is an insertion indicator.
'situation' becomes 'post' ('post' can be a synonym of 'situation'**).
'ale' going around 'post' is 'APOSTLE'.
(Other definitions for apostle that I've seen before include "Good man" , "Vigorous campaigner" , "Early Christian missionary" , "Holy person" , "Vigorous supporter" .)