Crossword Genius

Tree line to extend over (5)

Ross

I believe the answer is:

larch

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

'line to extend over' is the wordplay.
'line' becomes 'l'.
'to extend over' becomes 'arch' (I am not sure about this - if you are sure you should believe this answer much more).
'l'+'arch'='LARCH'

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(Other definitions for larch that I've seen before include "Coniferous tree with deciduous bright green needles" , "Deciduous conifer" , "wood" , "Supplier of timber" .)

I've seen this clue in The Independent.
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