Extract from probe's eye-wateringly gross (5)
I believe the answer is:
obese
'gross' is the definition.
(thesaurus)
'extract from probe's eye-wateringly' is the wordplay.
'extract from' indicates the answer is hidden within the clue (some letters extracted from the clue).
'OBESE' is hidden within 'probes eye wateringly'.
(Other definitions for obese that I've seen before include "Having excessive girth" , "Carrying far too much weight" , "Pathologically fat" , "Plump" , "Huge" .)