Pass round women's head covering (4)
I believe the answer is:
cowl
'covering' is the definition.
(I know that cowl is a type of protection)
'pass round women's head' is the wordplay.
'pass' becomes 'col' (col is a term for a mountain pass).
'round' means one lot of letters goes inside another.
'head' says to take the initial letters.
The first letter of 'womens' is 'w'.
'col' going around 'w' is 'COWL'.
(Other definitions for cowl that I've seen before include "Dried fruit" , "Cover for monk or chimney" , "Hood for monk or chimney" , "Monk's hood - chimney cover" , "form of protection?" .)