Home gets consent to opening (5)
I believe the answer is:
inlet
'to opening' is the definition.
(inlet can mean a small opening)
'home gets consent' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'gets' is a charade indicator (letters next to each other).
'consent' becomes 'let' (both can mean to allow or permit).
'in'+'let'='INLET'
(Other definitions for inlet that I've seen before include "Gulf" , "Arm off a larger body of water between headlands" , "Means of entry" , "Strip of water extending from sea into land" , "access point" .)