Group of artists in coach or train (6)
I believe the answer is:
school
This clue might be a double definition.
'group of artists in coach' is the first definition.
'school' can be an answer for 'coach' (both can mean to teach or train). I'm not certain of the 'group of artists in' bit.
'train' is the second definition.
(both can mean to teach or coach)
'or' acts as a link.
Can you help me to learn more?
(Other definitions for school that I've seen before include "Group of porpoises - academy" , "Teach; group of fish" , "Centre of learning" , "See 7" , "A number of swimmers joined" .)