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Large number certain to see crop circle? (7)

Ross

I believe the answer is:

tonsure

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'circle?' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?

'large number certain to see crop' is the wordplay.
'large number' becomes 'ton' (I've seen this in another clue).
'certain' becomes 'sure' (synonyms).
'to see' becomes 'v' (Latin 'vide', used to direct a reader to a source).
'crop' means to remove the last letter.
'ton'+'sure'+'v'='tonsurev'
'tonsurev' with its last letter taken off is 'TONSURE'.

Can you help me to learn more?

(Other definitions for tonsure that I've seen before include "Result of shaving" , "Monastic hairstyle" , "Shaven spot on monk's head" , "Removal of locks" , "Monk's bald spot" .)

I've seen this clue in The Telegraph.
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