One who carries, to shelter, steak (11)
I believe the answer is:
porterhouse
'steak' is the definition.
(porterhouse is a kind of steak)
'one who carries to shelter' is the wordplay.
'one who carries' becomes 'porter'.
'to shelter' becomes 'house' (housing is a kind of sheltering).
'porter'+'house'='PORTERHOUSE'
(Other definitions for porterhouse that I've seen before include "Type of steak" , "Place once selling steak" , "Some beef" .)