Tree with "helicopter seeds" (3)
I believe the answer is:
ash
'tree with helicopter seeds' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ash that I've seen before include "Tree with winged seeds" , "Knotty - - (Ken Dodd)" , "blonde" , "Woodland tree; result of burning" , "It's used for flooring" .)