You and I filling awfully large trousers? (7)

I believe the answer is:

legwear

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'trousers?' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'you and i filling awfully large' is the wordplay.
'you and i' becomes 'we'.
'filling' is an insertion indicator.
'awfully' is an anagram indicator.
'large' with letters rearranged gives 'legar'.
'we' going into 'legar' is 'LEGWEAR'.

Can you help me to learn more?

(Other definitions for legwear that I've seen before include "Eg, socks, stockings" , "Stockings etc" .)

I've seen this clue in The Times.

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