Maybe present chaps ahead of time for medical care (9)
I believe the answer is:
treatment
'for medical care' is the definition.
(I know that medical aid is a type of treatment)
'maybe present chaps ahead of time' is the wordplay.
'maybe present' becomes 'treat' (a present may be given as a treat).
'chaps' becomes 'men' (chap means a man).
'ahead of' says to put letters next to each other (some letters go in front of others).
'time' becomes 't' (abbreviation).
'treat'+'men'+'t'='TREATMENT'
(Other definitions for treatment that I've seen before include "Management of something, illness say" , "Medical care for injury" , "course of drugs" , "Discussion" , "The handling or management of something" .)