Knight crazy about English rose regularly ignored beauties (8)
I believe the answer is:
stunners
'beauties' is the definition.
('stunner' can be a synonym of 'beauty')
'knight crazy about english rose regularly ignored' is the wordplay.
'knight' becomes 'n' (chess).
'crazy' becomes 'nuts' (I've seen this before**).
'about' says the letters should be written in reverse.
'english' becomes 'e' (abbreviation).
'regularly ignored' means one should take alternating letters.
The alternating letters of 'rose' are 'rs'.
'n'+'nuts'='nnuts'
'nnuts' in reverse letter order is 'stunn'.
'stunn'+'e'+'rs'='STUNNERS'
(Another definition for stunners that I've seen is " beauties".)