Group founder to receive millions over year (6)
I believe the answer is:
family
'group' is the definition.
(I know that group can be written as family)
'founder to receive millions over year' is the wordplay.
'founder' becomes 'fail' (I've seen this in another clue).
'to receive' is an insertion indicator.
'millions' becomes 'm' (abbreviation).
'over' is a charade indicator (letters next to each other).
'year' becomes 'y'.
'fail' enclosing 'm' is 'famil'.
'famil'+'y'='FAMILY'
(Other definitions for family that I've seen before include "line" , "Kin" , "One's relations" , "Nearest and dearest" , "Household" .)