Stay over with the French in order to eat (6)
I believe the answer is:
edible
'in order to eat' is the definition.
(I've seen this before)
'stay over with the french' is the wordplay.
'stay' becomes 'bide' (biding is a kind of staying).
'over' is a reversal indicator.
'with' means one lot of letters go next to another.
'the french' becomes 'le' ('the' in French).
'bide' in reverse letter order is 'edib'.
'edib'+'le'='EDIBLE'
(Other definitions for edible that I've seen before include "description of fare" , "Eatable" , "Esculent" , "Fit for consumption" , "OK for eating" .)