Made rennet concoction to show some affection (10)
I believe the answer is:
endearment
'some affection' is the definition.
(I've seen this in another clue)
'made rennet concoction' is the wordplay.
'concoction' is an anagram indicator.
'made'+'rennet'='maderennet'
'maderennet' is an anagram of 'ENDEARMENT'.
'to show' acts as a link.
(Other definitions for endearment that I've seen before include "Affectionate term" , "Fondness" , "Pet name" , "Expression of love" , "sign of affection" .)