Clever or smart (4)
I believe the answer is:
neat
This clue is a double definition.
'clever' is the first definition.
(I've seen this before)
'smart' is the second definition.
(synonyms)
(Other definitions for neat that I've seen before include "Taken without water" , "Well-trimmed" , "Trim - tidy - without water" , "descendant of 19 [AUROCHS]" , "bull, eg" .)