Gap for true pear recipe (8)
I believe the answer is:
aperture
'gap' is the definition.
(aperture is a kind of gap)
'true pear recipe' is the wordplay.
'recipe' indicates an anagram.
'true'+'pear'='truepear'
'truepear' anagrammed gives 'APERTURE'.
'for' is the link.
(Other definitions for aperture that I've seen before include "Opening, mostly small" , "Small hole or opening" , "'Hole, opening (8)'" , "An opening that admits light" , "Eye" .)