Rejected free bank getting more unpleasant (7)
I believe the answer is:
dirtier
'more unpleasant' is the definition.
('dirty' can be a synonym of 'unpleasant')
'rejected free bank getting' is the wordplay.
'rejected' shows that the letters should be reversed in order.
'free' becomes 'rid' ('rid' can be a synonym of 'free'**).
'bank' becomes 'tier' (I've seen this before).
'getting' says to put letters next to each other.
'rid' written backwards gives 'dir'.
'dir'+'tier'='DIRTIER'
(Other definitions for dirtier that I've seen before include "More filthy" , "Filthier" , "Less clean" , "cleaner? The opposite" , "More grubby" .)