Crossword Genius

Time to start fires (4,2)


I believe the answer is:

lets go

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

'time to start' is the wordplay.
'time' becomes 'lets' (I can't justify this - if you can you should give a lot more credence to this answer).
'to start' becomes 'go' ('go' can be a synonym of 'start').
'lets'+'go'='LETS GO'

Can you help me to learn more?

(Other definitions for lets go that I've seen before include "Liberates" , "fires" , "Order to leave" , "Releases from one's grip" , "Come on then, we're off!" .)

I've seen this clue in The Times and The Sunday Times.
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