Send some French dressing (8)
I believe the answer is:
despatch
'send' is the definition.
(despatching is a kind of sending)
'some french dressing' is the wordplay.
'some french' becomes 'des'.
'dressing' becomes 'patch' (both can mean a fabric covering).
'des'+'patch'='DESPATCH'
(Other definitions for despatch that I've seen before include "Send away" , "Send off, kill" , "Send out of cash dept" , "Send out - chest pad (anag)" , "Give send-off" .)