Not so easy to accept egg from collector (7)
I believe the answer is:
hoarder
'collector' is the definition.
(hoarder is a kind of collector)
'not so easy to accept egg' is the wordplay.
'not so easy' becomes 'harder' ('hard' can be the opposite of 'easy' so perhaps 'harder' is reasonable for 'not so easy').
'to accept' indicates putting letters inside.
'egg' becomes 'o' (I've seen this in other clues).
'harder' enclosing 'o' is 'HOARDER'.
'from' acts as a link.
(Other definitions for hoarder that I've seen before include "Person gathering and storing objects" , "Miser; magpie" , "Person unlikely to throw things away" , "Saver" , "18 [MAGPIE] , perhaps" .)