Around end of game, playing squash, I'm nauseous (9)
I believe the answer is:
squeamish
'nauseous' is the definition.
(thesaurus)
'around end of game playing squash i'm' is the wordplay.
'around' is an insertion indicator.
'end of' suggests the final letters.
'playing' is an anagram indicator.
The last letter of 'game' is 'e'.
'squash'+'im'='squashim'
'squashim' anagrammed gives 'squamish'.
'e' placed inside 'squamish' is 'SQUEAMISH'.
(Other definitions for squeamish that I've seen before include "Fastidious and easily disgusted" , "Queasy" , "faint-hearted" , "Easily shocked, sickened" , "Easily sickened or disgusted" .)