Banged up hip and flank (6)
I believe the answer is:
inside
'banged up' is the definition.
(I've seen this before)
'hip and flank' is the wordplay.
'hip' becomes 'in' (I've seen this in other clues).
'and' means one lot of letters go next to another.
'flank' becomes 'side' (I've seen this before).
'in'+'side'='INSIDE'
(Other definitions for inside that I've seen before include "Internal" , "(Of information) from a confidential source" , "Middle" , "Not external, perhaps in prison" , "A sort of job" .)