Traveller abroad very keen on Japanese theatre (5)
I believe the answer is:
nomad
'traveller' is the definition.
(nomad is a kind of traveller)
'keen on japanese theatre' is the wordplay.
'keen' becomes 'mad' (both can mean enthusiastic about).
'on' means one lot of letters go next to another.
'japanese theatre' becomes 'no' (I can't explain this - if you can you should believe this answer much more).
'mad' put after 'no' is 'NOMAD'.
'abroad very' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for nomad that I've seen before include "drifter" , "One travels from place to place with no permanent home" , "Member of travelling people" , "Member of a wandering pastoral community" , "Unsettled character" .)