Head covering for when the rain is scattered (7)
I believe the answer is:
hairnet
'head covering' is the definition.
(item worn to cover one's hair)
'the rain is scattered' is the wordplay.
'is scattered' is an anagram indicator.
'the'+'rain'='therain'
'therain' is an anagram of 'HAIRNET'.
'for when' acts as a link.
(Other definitions for hairnet that I've seen before include "In heart (anag)" , "Tonsorial restraint" , "Lock-keeper" , "A woman may wear this" , "Cover for head" .)