Gauging of eaten summer produce (11)
I believe the answer is:
measurement
'gauging' is the definition.
(thesaurus)
'eaten summer produce' is the wordplay.
'produce' indicates anagramming the letters.
'eaten'+'summer'='eatensummer'
'eatensummer' is an anagram of 'MEASUREMENT'.
'of' is the link.
(Other definitions for measurement that I've seen before include "Mensuration" , "Dimension" , "Size" , "What a ruler may give" .)