Crossword Genius

Large tin becomes essential (8)

Ross

I believe the answer is:

integral

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

'large tin becomes' is the wordplay.
'becomes' indicates an anagram.
'large'+'tin'='largetin'
'largetin' with letters rearranged gives 'INTEGRAL'.

(Other definitions for integral that I've seen before include "Belonging as an essential part" , "Forming an essential part" , "form whole" , "Maths function; entire" , "contributing to unity" .)

I've seen this clue in The Globe and Mail.
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