Square, on occasions? (5)

I believe the answer is:

times

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'square on occasions?' is the definition.
'times' can be an answer for 'occasions?' (I've seen this in another clue). I'm not sure about the 'square on' bit.

'square on occasions?' is the wordplay.
'square' becomes 'T' (a T-Square is a technical drawing instrument).
'on occasions?' becomes 'imes' (I can't justify this - if you can you should give a lot more credence to this answer).
't'+'imes'='TIMES'

Can you help me to learn more?

(Other definitions for times that I've seen before include "See 1" , "measures the length of something" , "''For the ..., they are a'changin'''(Bob Dylan)" , "Paper" , "Occasions; multiplied by" .)

I've seen this clue in the Evening Standard.

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