Excellent facility for bride-to-be's stuff? No! (3-6)
I believe the answer is:
top-drawer
'excellent' is the definition.
(I've seen this in another clue)
'facility for bride-to-be's stuff? no' is the wordplay.
I cannot really understand how this works, but
'for' could be 'to' (eg both can mean 'in the opinion of') and 'to' is present in the answer.
'stuff?' could be 'draw' (draw is a kind of stuff) and 'draw' is found within the answer.
The remaining letters 'per' 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).
(Other definitions for top-drawer that I've seen before include "Excellent" , "Of the highest standing" , "Perfect" , "of high social standing" .)