Gold that is left for Oxford college window (5)
I believe the answer is:
oriel
'window' is the definition.
(oriel is a kind of window)
'gold that is left for' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'that is' becomes 'i.e.' (synonyms).
'left for' becomes 'l' (I've seen this in other clues).
'or'+'ie'+'l'='ORIEL'
'oxford college' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
(Other definitions for oriel that I've seen before include "Type of window; Oxford college" , "First-floor bay (window)" , "Large snake" , "Recessed bay window" , "Loire (anag.)" .)