Does order small pills (5)

I believe the answer is:
doses
'pills' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps they are linked in a way I don't understand?
'does order small' is the wordplay.
'order' is an anagram indicator.
'small' becomes 's' (abbreviation - e.g. clothes size).
'does' anagrammed gives 'dose'.
'dose'+'s'='DOSES'
Can you help me to learn more?
(Other definitions for doses that I've seen before include "draughts" , "Administers medicine to (someone)" , "Gives medicine to" , "Measured amounts of medicine" , "Medicates" .)
