Substitute for bear at home (5,2)
I believe the answer is:
stand in
'substitute' is the definition.
(synonyms)
'bear at home' is the wordplay.
'bear' becomes 'stand' (bear can mean to stand or endure).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'stand'+'in'='STAND-IN'
'for' is the link.
(Other definitions for stand in that I've seen before include "Substitute or deputy" , "Deputise; sail close to the shore" , "Sub" , "Representative" , "cover" .)