Border of the British Empire? (3)

I believe the answer is:

hem

'border' is the definition.
(I've seen this before)

'of the british empire?' is the wordplay.
'of' says the answer is hidden in the clue.
'HEM' is hidden within 'british empire'.

(Other definitions for hem that I've seen before include "may attract attention" , "Stitched edge of garment" , "Part of skirt" , "Sewn edge to fabric" , "Double-backed cloth border" .)

I've seen this clue in the Evening Standard.

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