Space at front of border for plant (5)
I believe the answer is:
embed
'plant' is the definition.
(I've seen this before)
'space at front of border' is the wordplay.
'space' becomes 'em' (in typography, a space as wide as a letter 'm').
'at front of' says to put letters next to each other.
'border' becomes 'bed' (a flower bed is the border of a garden**).
'em'+'bed'='EMBED'
'for' is the link.
(Other definitions for embed that I've seen before include "one placed in a military unit" , "Fix firmly (in ground)" , "war reporter" , "Implant (eg, an idea)" , "Put entirely inside something else" .)