Hole spoiling pear? True (8)
I believe the answer is:
aperture
'hole' is the definition.
(I know that aperture is a type of hole)
'spoiling pear? true' is the wordplay.
'spoiling' indicates anagramming the letters.
'pear'+'true'='peartrue'
'peartrue' anagrammed gives 'APERTURE'.
(Other definitions for aperture that I've seen before include "Opening, gap" , "Hole, gap" , "Opening through which light enters a camera" , "Opening (on camera, for example)" , "Narrow opening" .)