Arrested outlaw sent back to bed (6)
I believe the answer is:
nabbed
'arrested' is the definition.
('nab' can be a synonym of 'arrest')
'outlaw sent back to bed' is the wordplay.
'outlaw' becomes 'ban' (banning is a kind of outlawing).
'sent back' says the letters should be written backwards.
'to' means one lot of letters go next to another.
'ban' backwards is 'nab'.
'nab'+'bed'='NABBED'
(Other definitions for nabbed that I've seen before include "Caught (in the act)" , "Caught someone doing something wrong" , "Arrested" , "Seized suddenly" .)