Left bumpkin's farmhouse? (4)
I believe the answer is:
loaf
'farmhouse?' is the definition.
(farmhouse is a type of loaf)
'left bumpkin's' is the wordplay.
'left' becomes 'l' (common abbreviation).
'bumpkin' becomes 'oaf' (I've seen this before).
'l'+'oaf'='LOAF'
(Other definitions for loaf that I've seen before include "Pass time idly" , "Lounge about" , "bloomer, say" , "more than just crumbs!" , "Bum about" .)