Head technician concerned with cash machine, went out west for medical care (9)
I believe the answer is:
treatment
'medical care' is the definition.
(treatment is a kind of medical care)
'head technician concerned with cash machine went out west' is the wordplay.
'head' says to take the initial letters.
'concerned with' becomes 're' (re can mean regarding, concerning).
'cash machine' becomes 'a t m' (synonyms).
'went out west' becomes 'ent' (I can't justify this - if you can you should believe this answer much more).
The initial letter of 'technician' is 't'.
't'+'re'+'atm'+'ent'='TREATMENT'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for treatment that I've seen before include "The handling or management of something" , "Medical attention" , "prescribed drugs possibly" , "Handling - therapy" , "patient progress" .)