Crossword Genius

Not feeling good at a discount (5,3)

Ross

I believe the answer is:

below par

I believe this clue is a double definition.

'not feeling good' is the first definition.
(below par can mean unwell)

'at a discount' is the second definition.
(thesaurus)

(Other definitions for below par that I've seen before include "Worse than usual" , "Not in full health" , "Out of sorts" , "Lower than the average, as in golf score ( 5, 3)" , "Worse than expected" .)

I've seen this clue in The Telegraph.
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