Steam iron briefly dispersed spray (8)
I believe the answer is:
atomiser
'spray' is the definition.
(I know that spray can be written as atomiser)
'steam iron briefly dispersed' is the wordplay.
'briefly' means to remove the last letter.
'dispersed' indicates an anagram.
'steam'+'iron'='steamiron'
'steamiron' with its final letter taken away is 'steamiro'.
'steamiro' anagrammed gives 'ATOMISER'.
(Other definitions for atomiser that I've seen before include "Container that releases liquid in a fine spray" , "Amortise for spray-creating device" , "Dispenser spraying perfume as a fine mist" , "Perfume spray" , "Dispenser for turning liquid into a fine spray" .)