Friend tucked in showing relish (6)
I believe the answer is:
palate
'relish' is the definition.
(I've seen this before)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for palate that I've seen before include "part of trap" , "Roof of the mouth, seat of taste" , "Liking" , "One may savour" , "having ability to appreciate good food" .)