Get down from sill on front of farmhouse (6)
I believe the answer is:
fledge
'get down' is the definition.
(fledge means to acquire feathers or 'down')
'sill on front of farmhouse' is the wordplay.
'sill' becomes 'ledge' (I've seen this in another clue).
'on' says to put letters next to each other.
'front of' indicates taking the first letters.
The initial letter of 'farmhouse' is 'f'.
'ledge' after 'f' is 'FLEDGE'.
'from' is the link.
(Other definitions for fledge that I've seen before include "(Of a bird) develop wing feathers" , "Grow feathers" , "Look after till ready to fly" , "Develop flight feathers" .)