Crossword Genius

Border of higher mathematics (3)

Ross

I believe the answer is:

hem

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

'of higher mathematics' is the wordplay.
'of' indicates a hidden word.
'HEM' is hidden within 'higher mathematics'.

(Other definitions for hem that I've seen before include "Border; fringe" , "Bottom of a garment" , "Double-backed border of a garment" , "may attract attention" , "It draws attention to" .)

I've seen this clue in the Evening Standard.
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