Plant found by neat border (5)
I believe the answer is:
oxlip
'plant' is the definition.
(oxlip is a kind of plant)
'by neat border' is the wordplay.
'by' means one lot of letters go next to another.
'neat' becomes 'ox' (neat historically meant a cow or ox).
'border' becomes 'lip' (I've seen this in another clue).
'ox' next to 'lip' is 'OXLIP'.
'found' acts as a link.
(Other definitions for oxlip that I've seen before include "Woodland plant" , "It's a bloomer" , "Type of primula" , "Plant with small drooping pale yellow flowers" , "Species of Primula" .)