What’s permissible in the middle of Tirol wood (5)
I believe the answer is:
iroko
'wood' is the definition.
(I've seen this before)
'what's permissible in the middle of tirol' is the wordplay.
'what's permissible' becomes 'ok' (I can't explain this - if you can you should give a lot more credence to this answer).
'in the' indicates putting letters inside.
'middle of' indicates the central letters.
The middle of 'tirol' is 'iro'.
'ok' put within 'iro' is 'IROKO'.
Can you help me to learn more?
(Other definitions for iroko that I've seen before include "A light-coloured African hardwood" , "Tropical hardwood" , "Inventor of early music synthesizer" , "tree" , "Tropical wood often used in place of teak" .)