Trained in computer science and medicine (5)
I believe the answer is:
aimed
'trained' is the definition.
('aim' can be a synonym of 'train')
'computer science and medicine' is the wordplay.
'computer science' becomes 'ai' (AI is an example).
'and' says to put letters next to each other.
'medicine' becomes 'med' (as in the informal term 'meds').
'ai'+'med'='AIMED'
'in' is the link.
(Other definitions for aimed that I've seen before include "Pointed towards" , "Directed towards specified goal" , "Pointed a weapon at" , "Set sights on for a dime" , "Tried; pointed" .)