Neat; decorate (4)
I believe the answer is:
trim
This clue is a double definition.
'neat' is the first definition.
(synonyms)
'decorate' is the second definition.
(I know that trim is a more specific form of the action decorate)
(Other definitions for trim that I've seen before include "Neat and orderly" , "border" , "Reduce slightly" , "Make smooth by cutting away irregular parts" , "Edging material - in good order" .)