On vacation, person blankets chilly shrimp (5)
I believe the answer is:
prawn
'shrimp' is the definition.
(I know that shrimp can be written as prawn)
'on vacation person blankets chilly' is the wordplay.
'on vacation' means to remove the middle letters.
'blankets' indicates putting letters inside (I've seen this in other clues).
'chilly' becomes 'raw' (I've seen this before).
'person' with its centre removed is 'pn'.
'pn' going around 'raw' is 'PRAWN'.
(Other definitions for prawn that I've seen before include "Marine crustacean" , "Popular oriental snack" , "Small, edible crustacean" , "Cocktail ingredient" , "Bit of seafood" .)