Keeping rook away, rip off bit of bread (7)
I believe the answer is:
crouton
'bit of bread' is the definition.
(I've seen this before)
'keeping rook away rip off' is the wordplay.
'keeping' is an insertion indicator.
'rook' becomes 'r' (abbreviation in chess).
'away' becomes 'out' (synonyms).
'rip off' becomes 'con' (conning is a kind of ripping off).
'r'+'out'='rout'
'rout' inserted inside 'con' is 'CROUTON'.
(Other definitions for crouton that I've seen before include "One might be in the soup" , "little bit of bread" , "Fried garnish for soup" , "Chopped fried bread" , "One's in the soup" .)