Clique member cool with scrumpy they say (7)
I believe the answer is:
Here is my best explanation:
'clique member' is the definition.
'cool with scrumpy they say' is the subsidiary indication.
'cool' becomes 'in' (I've seen this in other clues).
'with' says to put letters next to each other.
'scrumpy' becomes 'cider' (I've seen this before).
'they say' indicates a 'sounds like' (homophone) clue.
'cider' is a homophone of 'sider'.
(Other definitions for insider that I've seen before include "One with privileged information", "Member of select group in the know", "One privy to restricted information", "One privy to info by being within organisation", "Member of charmed circle", "Member of a specific group", "He's in the circle, knows the right people", "Privileged member of a group", "This trading is illegal, based on confidential information" and "Person privy to secret information".)