Guy may be put atop this tree in Book One (7)

I believe the answer is:

bonfire

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'guy may be put atop this' is the definition.
The definition suggests a singular noun which matches the answer.

'tree in book one' is the wordplay.
'tree' becomes 'fir' (fir tree is a kind of tree).
'in' indicates putting letters inside.
'book' becomes 'b' (abbreviation for book).
'b'+'one'='bone'
'fir' put within 'bone' is 'BONFIRE'.

Can you help me to learn more?

(Other definitions for bonfire that I've seen before include "If Ron be outside, is he alight?" , "Guy Fawkes Night blaze" , "Signal" , "It's usually lit on Guy Fawkes' day" , "Large outdoor fire" .)

I've seen this clue in The Independent.

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