Extra frugal (5)

I believe the answer is:

spare

I believe this clue is a double definition.

'extra' is the first definition.
(both can mean left over)

'frugal' is the second definition.
(thesaurus)

(Other definitions for spare that I've seen before include "Let off; extra" , "Not required" , "This tyre is for emergencies" , "Thin; left over" , "Leftover" .)

I've seen this clue in The Times.

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