Helicopter carrying old-fashioned peasant (10)
I believe the answer is:
clodhopper
'peasant' is the definition.
(thesaurus)
'helicopter carrying old-fashioned' is the wordplay.
'helicopter' becomes 'chopper' (synonyms).
'carrying' indicates putting letters inside.
'fashioned' indicates an anagram.
'old' is an anagram of 'lod'.
'chopper' placed around 'lod' is 'CLODHOPPER'.
(Other definitions for clodhopper that I've seen before include "Clumsy fellow" , "yokel" , "Oaf - heavy shoe" , "bumpkin" , "Fool" .)