Spare jam (8)

I believe the answer is:

preserve

I believe this clue is a double definition.

'spare' is the first definition.
(thesaurus)

'jam' is the second definition.
(thesaurus)

(Other definitions for preserve that I've seen before include "Maintain; keep safe" , "Maintain - jam" , "Toast option" , "Prevent from rotting" , "Guard" .)

I've seen this clue in The Telegraph.

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