Remote branch not popular appointment (7)
I believe the answer is:
outpost
'remote branch' is the definition.
(I've seen this before)
'not popular appointment' is the wordplay.
'not popular' becomes 'out' (as opposed to in, fashionable).
'appointment' becomes 'post' (appointment to a job).
'out'+'post'='OUTPOST'
(Other definitions for outpost that I've seen before include "A distant branch or settlement" , "isolated settlement" , "Small group of soldiers" , "Distant military camp" , "Small camp some distance away from the main army" .)