Space kept by priest for fragrant resin (5)
I believe the answer is:
elemi
'fragrant resin' is the definition.
(I've seen this before)
'space kept by priest' is the wordplay.
'space' becomes 'em' (in typography, a space as wide as a letter 'm').
'kept by' means one lot of letters goes inside another.
'priest' becomes 'eli' (biblical figure).
'em' placed into 'eli' is 'ELEMI'.
'for' is the link.
(Other definitions for elemi that I've seen before include "Resinous stuff" , "Oleoresin" , "It's fragrance" , "Fragrant tree resin used as incense - I'm Lee (anag)" , "Fragrant resin used as incense - Emile (anag)" .)