Bound to have some nude portraits sent back (5)
I believe the answer is:
roped
'bound' is the definition.
(bound with rope)
'some nude portraits sent back' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'sent back' is a reversal indicator.
'depor' is hidden within 'nude portraits'.
'depor' in reverse letter order is 'ROPED'.
'to have' acts as a link.
(Other definitions for roped that I've seen before include "held by painter" , "Lassoed" , "(Of climbers) connected together by line" .)