Increasingly intolerant, hurried back to confront bowman perhaps (8)
I believe the answer is:
narrower
'increasingly intolerant' is the definition.
(becoming more narrow-minded)
'hurried back to confront bowman perhaps' is the wordplay.
'hurried' becomes 'ran' (running is a kind of hurrying).
'back' says the letters should be written backwards.
'to confront bowman perhaps' becomes 'rower' (I can't explain this - if you can you should believe this answer much more).
'ran' in reverse letter order is 'nar'.
'nar'+'rower'='NARROWER'
Can you help me to learn more?
(Other definitions for narrower that I've seen before include "With less width" , "Thinner" , "Less wide" .)