Porcine jockeys love cheese (8)
I believe the answer is:
pecorino
'cheese' is the definition.
(I've seen this before)
'porcine jockeys love' is the wordplay.
'jockeys' indicates anagramming the letters.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'porcine' with letters rearranged gives 'pecorin'.
'pecorin'+'o'='PECORINO'
(Other definitions for pecorino that I've seen before include "Italian sheep's cheese" , "Italian cheese made from ewe's milk" , "Hard cheese!" .)