Feeling bad and playing the course well (5,3)

I believe the answer is:

below par

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'feeling bad' is the definition.
'below par' can be an answer for 'bad' (thesaurus). I'm unsure of the 'feeling' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

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

I've seen this clue in The Telegraph.

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