Clap home game by leading soccer star with megalomania (7,7)

'leading soccer star with megalomania' is the definition.
I know nothing about this answer so I can't tell whether this works.

'clap home game by' is the wordplay.
I cannot really see how this works, but
'home' could be 'h' (abbreviation as used in sports fixtures) and 'h' is present in the answer.
'game' could be 'p' (I have seen 'French game ' mean 'p' so perhaps 'game' could also mean 'p') and 'p' is found in the answer.
'by' could be 'x' (multiplication sign) and 'x' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?