Consumer welcoming small festival (6)
I believe the answer is:
easter
'festival' is the definition.
(I've seen this before)
'consumer welcoming small' is the wordplay.
'consumer' becomes 'eater' (eater is a kind of consumer).
'welcoming' indicates putting letters inside (in sense of 'inviting in').
'small' becomes 's' (abbreviation - e.g. clothes size).
'eater' enclosing 's' is 'EASTER'.
(Other definitions for easter that I've seen before include "Christian festival in Spring" , "Major Christian festival in April" , "Main Christian festival" , "Sort of tide" , "festival time" .)