75 per cent of brewer's output facing rash cuts ahead (8)
I believe the answer is:
beehives
'75 per cent of brewer's output facing' is the definition.
I can't judge whether this defines the answer.
'rash cuts ahead' is the wordplay.
I cannot really see how this works, but
'rash' could be 'hives' (hives is a kind of rash) and 'hives' is located in the answer.
The remaining letters 'bee' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for beehives that I've seen before include "Habitations for hymenoptera" , "An apiarist cares for them" .)