Tree with a curve to the left (5)
I believe the answer is:
larch
'tree' is the definition.
(larch tree is a kind of tree)
'a curve to the left' is the wordplay.
'a curve' becomes 'arch' (arch is a kind of curve).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the left' becomes 'l' (common abbreviation).
'arch' after 'l' is 'LARCH'.
'with' acts as a link.
(Other definitions for larch that I've seen before include "Supplier of timber" , "Coniferous tree with deciduous bright green needles" , "Deciduous conifer" , "wood" .)