Devoted couple devil robs cruelly (9)
I believe the answer is:
lovebirds
'devoted couple' is the definition.
(couple in love)
'devil robs cruelly' is the wordplay.
'cruelly' indicates anagramming the letters (I've seen this in other clues).
'devil'+'robs'='devilrobs'
'devilrobs' with letters rearranged gives 'LOVEBIRDS'.
(Other definitions for lovebirds that I've seen before include "Small African parrots or romantic couples" , "Small African parrots or romantic couple" , "Affectionate parrots" .)