Medicine, money and time involved in treatment (8)
I believe the answer is:
tincture
'medicine' is the definition.
(tincture is a kind of medicine)
'money and time involved in treatment' is the wordplay.
'money' becomes 'tin' (old-fashioned slang term for money).
'and' says to put letters next to each other.
'time' becomes 't' (abbreviation).
'involved in' indicates putting letters inside.
'treatment' becomes 'cure' (medical treatment).
't' placed into 'cure' is 'cture'.
'tin'+'cture'='TINCTURE'
(Other definitions for tincture that I've seen before include "Medicine; slight trace" , "Heraldic colour; medicine" , "smack?" , "Slight tinge or trace of some element" , "Slight flavour" .)