Very unfriendly back home on the farm (6)
I believe the answer is:
frosty
'very unfriendly' is the definition.
(I've seen this before)
'back home on the farm' is the wordplay.
'back' becomes 'fro' (synonyms).
'home on the farm' becomes 'sty' (I've seen this in another clue).
'fro'+'sty'='FROSTY'
(Other definitions for frosty that I've seen before include "Cold and unfriendly (glance or reception?)" , "showing little enthusiasm" , "Lacking in warmth" , "Icy cold" , "Chilly in attitude, like musical snowman" .)