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' means one lot of letters goes inside another.
'fashioned' is an anagram indicator.
'old' is an anagram of 'lod'.
'chopper' going around 'lod' is 'CLODHOPPER'.
(Other definitions for clodhopper that I've seen before include "Clumsy fellow" , "yokel" , "Oaf - heavy shoe" , "bumpkin" , "Fool" .)