Blows hydrogen into wind sleeves (6)
I believe the answer is:
shocks
'blows' is the definition.
('shock' can be a synonym of 'blow')
'hydrogen into wind sleeves' is the wordplay.
'hydrogen' becomes 'H' (H is the chemical symbol for hydrogen).
'into' is an insertion indicator.
'wind sleeves' becomes 'socks' ('sock' can be a synonym of 'wind sleeve').
'h' going within 'socks' is 'SHOCKS'.
(Other definitions for shocks that I've seen before include "Effects of charges of electricity" , "Surprises, sometimes electrical" , "Jolts, jars" , "Appals" , "'Stuns, jolts (6)'" .)