Very good in bed? Suffer the consequences! (3,2)
I believe the answer is:
cop it
'suffer the consequences' is the definition.
(to cop it is to receive blame)
'very good in bed?' is the wordplay.
'very good' becomes 'pi' (old-fashioned term for 'pious').
'in' means one lot of letters goes inside another.
'bed?' becomes 'cot' (cot is a kind of bed).
'pi' placed into 'cot' is 'COP IT'.
(Other definitions for cop it that I've seen before include ""get in loads of trouble!"" , "Get into trouble; be killed" , "Suffer the consequences!" , "Get it in the neck" , "Be punished" .)