Way out in the theatre perhaps (5-5)
I believe the answer is:
avant-garde
'way out' is the definition.
(thesaurus)
'theatre perhaps' is the wordplay.
I cannot quite see how this works, but
'theatre' could be 'nt' (National Theatre) and 'nt' is present in the answer.
This explanation may well be incorrect...
'in the' is the link.
Can you help me to learn more?
(Other definitions for avant-garde that I've seen before include "Daringly innovative or unconventional" , "In the arts, radically new and daring" , "Experimental (art)" , "New and experimental" , "Radical - daring" .)