Creature that a pirate holds (5)
I believe the answer is:
tapir
'creature' is the definition.
(I've seen this before)
'that a pirate holds' is the wordplay.
'holds' indicates a hidden word.
'TAPIR' is hidden within 'that a pirate'.
(Other definitions for tapir that I've seen before include "creature" , "Tropical hoofed mammal with a flexible proboscis" , "A trip (anag) - animal" , "Long-nosed, hoofed mammal" , "Nocturnal mammal with a short flexible proboscis" .)