Garlic piece in cold relish (5)
I believe the answer is:
clove
'garlic piece' is the definition.
(I've seen this in another clue)
'cold relish' is the wordplay.
'cold' becomes 'C' (eg on taps).
'relish' becomes 'love'.
'c'+'love'='CLOVE'
'in' is the link.
(Other definitions for clove that I've seen before include "Spice, used whole or ground" , "Flower bud used as a spice" , "Pungent spice" , "A small bulb as of garlic" , "Payment for hostage" .)