Top males welcomed by clubs, say (6)
I believe the answer is:
summit
'top' is the definition.
(I know that top can be written as summit)
'males welcomed by clubs say' is the wordplay.
'males' becomes 'mm' (an abbreviation for male written twice).
'welcomed by' is an insertion indicator (letters welcomed inside).
'clubs say' becomes 'suit' (I've seen this in other clues).
'mm' put into 'suit' is 'SUMMIT'.
(Other definitions for summit that I've seen before include "Highest point of a mountain" , "important meeting" , "conference?" , "Top of a mountain, or meeting between heads of government" , "Apex" .)