Fix a note on a tree (4)

I believe the answer is:

pine

'a tree' is the definition.
(pine tree is a kind of tree)

'fix a note on' is the wordplay.
'fix' becomes 'pin' (to pin is to fix in place).
'a note' becomes 'e' (musical note).
'on' says to put letters next to each other.
'pin'+'e'='PINE'

(Other definitions for pine that I've seen before include "Kind of needle" , "Yearn for evergreen tree" , "Coniferous tree" , "Thirst" , "Long - timber" .)

I've seen this clue in the Evening Standard.

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