Orderly produces sample of medicine attentively (4)
I believe the answer is:
neat
'orderly' is the definition.
('neat' can be a synonym of 'orderly')
'sample of medicine attentively' is the wordplay.
'sample of' indicates the answer is hidden within the clue (I've seen this in other clues).
'NEAT' is hidden in the letters of 'medicine attentively'.
'produces' is the link.
(Other definitions for neat that I've seen before include "Trim - undiluted" , "Nicely proportioned" , "bull, eg" , "beef" , "Shipshape" .)