Beauty fair not opening creates mess (8)
I believe the answer is:
dishevel
'mess' is the definition.
(I've seen this before)
'beauty fair not opening' is the wordplay.
I cannot really understand how this works, but
'beauty' could be 'dish' (slang term for an attractive person) and 'dish' is located in the answer.
This explanation may well be incorrect...
'creates' acts as a link.
Can you help me to learn more?
(Other definitions for dishevel that I've seen before include "Disarrange - rumple" , "Ruffle (e.g. hair)" , "Get ruffled" , "Disorder, ruffle" , "get into a mess" .)