The Crossword Centre Clue-Writing Competition

CCCWC September competition voters’ comments
 
Clue no. 31: THREE lumps of sugar with tea? And time for stirring?

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A clue to GUESTIMATE.
5 comments refer to this clue (from 5 competitors, 0 others)

Here is the text

Comments on the clue
1.Don't really see how this qualifies as an &lit
2.Very nice idea, but I think it leads to GUESTIMATES rather than the singular.
3.The surface isn't a clear example of 'guestimate' to me
4.Very ingenious idea, but the overall clue lacks a clear definition.
5.I don't get the definition here