Creature carried by Nepalese as luggage (3,4)
I believe the answer is:
sea slug
'creature' is the definition.
(sea slug is a kind of animal)
'carried by nepalese as luggage' is the wordplay.
'carried by' indicates a hidden word.
'SEA-SLUG' is hidden within 'nepalese as luggage'.
(Other definitions for sea slug that I've seen before include "Shell-less marine mollusc" , "gastropod mollusc" , "Creature" .)