Pie concocted with grouse and bit of fruit peel (7)
I believe the answer is:
epicarp
'fruit peel' is the definition.
(I've seen this in another clue)
'pie concocted with grouse' is the wordplay.
'concocted' indicates anagramming the letters.
'with' is a charade indicator (letters next to each other).
'grouse' becomes 'carp' (both can mean to complain).
'pie' is an anagram of 'epi'.
'epi'+'carp'='EPICARP'
'and bit of' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for epicarp that I've seen before include "Skin" , "Part of fruit" , "Bit of fruit" .)