Some seed germinating in the border (4)
I believe the answer is:
edge
'the border' is the definition.
('edge' can be a synonym of 'border')
'some seed germinating in' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'EDGE' is hidden in the letters of 'seed germinating in'.
(Other definitions for edge that I've seen before include "Guitarist with U2" , "Steal" , "Force" , "Brink or border" , "Golden ingot" .)