Pamphlet or farm machine (7)
I believe the answer is:
tractor
'farm machine' is the definition.
(I've seen this in another clue)
'pamphlet or' is the wordplay.
'pamphlet' becomes 'tract' (synonyms).
'tract'+'or'='TRACTOR'
(Other definitions for tractor that I've seen before include "Powerful farm vehicle for heavy work" , "I can draw" , "Type of truck with a a cab but no body" , "Agricultural vehicle" , "Tower" .)