Wind through blades creates unseen danger (5,2,3,5)
I believe the answer is:
snake in the grass
'unseen danger' is the definition.
(term for a hidden threat)
'wind through blades' is the wordplay.
'wind' becomes 'snake' (snaking is a kind of winding).
'through' becomes 'in'.
'blades' becomes 'the grass' (as in blades of grass).
'snake'+'in'+'thegrass'='SNAKE IN THE GRASS'
'creates' acts as a link.
(Other definitions for snake in the grass that I've seen before include "nasty person who turns out to be traitor" , "one shouldn't meet with one on the Emerald Isle?" , "Treacherous person" , "unsuspected danger" , "Judas?" .)