Crossword Genius

Number collecting wood for burning (2,4)

Ross

I believe the answer is:

on fire

'burning' is the definition.
(thesaurus)

'number collecting wood' is the wordplay.
'number' becomes 'one' (one is a kind of number).
'collecting' is an insertion indicator.
'wood' becomes 'fir' (fir is a kind of wood).
'one' placed around 'fir' is 'ON FIRE'.

'for' acts as a link.

(Other definitions for on fire that I've seen before include "Excited or ablaze" , "Burning" , "Alight" , "Enthusiastic" , "Eager" .)

I've seen this clue in The Telegraph and the Financial Times.
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