Crossword Genius

The field of simple arithmetic (3)

Ross

I believe the answer is:

lea

'the field' is the definition.
(lea can mean a meadow or field of grass)

'of simple arithmetic' is the wordplay.
'of' indicates a hidden word.
'LEA' is hidden within 'simple arithmetic'.

(Other definitions for lea that I've seen before include "Grass area" , "Open area of grassy or arable land" , "Tract of pastureland" , "Meadow (poetic)" , "Open grassy land; river" .)

I've seen this clue in the Evening Standard.
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