Perhaps a teddy bear, somewhat fed up? (5)
I believe the answer is:
sated
'fed up?' is the definition.
(sated can mean completely fed)
'perhaps a teddy bear somewhat' is the wordplay.
'somewhat' indicates the answer is hidden within the clue.
'SATED' is hidden within 'perhaps a teddy bear'.
(Other definitions for sated that I've seen before include "Filled to satisfaction" , "Indulged to the full" , "with no empty spaces?" , "completely filled?" , "Stuffed with dates" .)