Cast get a car to Petersham? (9)
I believe the answer is:
greatcoat
'petersham?' is the definition.
(Petersham is a type of greatcoat)
'cast get a car to' is the wordplay.
'cast' indicates anagramming the letters (letters are dispersed or cast around).
'get'+'a'+'car'+'to'='getacarto'
'getacarto' is an anagram of 'GREATCOAT'.
(Other definitions for greatcoat that I've seen before include "what a soldier might wear" , "Military outer wear" , "costume?" , "What a soldier may have on" , "piece of clothing" .)