Crossword Genius

Ignoring sweeper, a member of Arsenal's first XI blocks Gabriel's header (8,5)

Ross

I believe the answer is:

brushing aside

I'm a little stuck... Click here to teach me more about this clue!

'ignoring' is the definition.
('brush aside' can be a synonym of 'ignore')

'sweeper a member of arsenal's first xi blocks gabriel's header' is the wordplay.
I cannot really understand how this works, but
'sweeper' could be 'brush' (something which sweeps) and 'brush' is located in the answer.
'a' is present in the answer.
'first' could be 'i' (Roman numeral for one or first) and 'i' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Telegraph.
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