Needing liniment (4)
I believe the answer is:
achy
'needing liniment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for achy that I've seen before include "Hurting" , "Giving pain" , "Suffering minor pains" , "Causing steady dull pain" , "Suffering from dull pains" .)