The best ointment? (5)
I believe the answer is:
cream
This clue is a double definition.
'the best' is the first definition.
(as in 'the cream of the crop')
'ointment?' is the second definition.
('cream' can be a synonym of 'ointment')
(Other definitions for cream that I've seen before include "Dairy product" , "Best - ointment" , "Top or best part" , "The best part -of the crop" , "Fat-rich part of milk" .)