Crossword Genius

Fifth wheel (5)

Ross

I believe the answer is:

spare

'fifth wheel' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for spare that I've seen before include "Thin; left over" , "slit at top of trousers in Scotland" , "Excess to requirements" , "Leftover" , "Additional - for use when needed" .)

I've seen this clue in the Penny Press.
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