Serving includes ram's heart for taste (6)
I believe the answer is:
palate
'taste' is the definition.
(palate can mean an ability to distinguish tastes)
'serving includes ram's heart' is the wordplay.
'serving' becomes 'plate'.
'includes' indicates putting letters inside.
'heart' says to take the centre.
The middle letter of 'ram' is 'a'.
'plate' placed around 'a' is 'PALATE'.
'for' acts as a link.
(Other definitions for palate that I've seen before include "Liking" , "where taste is considered" , "part of trap" , "relish" , "Sense of taste at roof of mouth" .)