Crossword Genius

Margin outside themselves (3)

Ross

I believe the answer is:

hem

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

'margin' is the definition.
(I've seen this in another clue)

'outside themselves' is the wordplay.
'HEM' is hidden in amongst the letters.
But, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for hem that I've seen before include "Part of skirt" , "Double-backed cloth border" , "Border; fringe" , "Finished edge of a piece of cloth" , "may attract attention" .)

I've seen this clue in The Mirror.
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