Chap regularly raised beer: is it so tempting for a Persian? (6)
I believe the answer is:
catnip
'is it so tempting for a persian?' is the definition.
(Persian is a type of cat)
'chap regularly raised beer' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'raised' says the letters should be written in reverse (going up in a down clue).
'beer' becomes 'pint' (beer is typically served by the pint).
The alternate letters of 'chap' are 'ca'.
'pint' backwards is 'tnip'.
'ca'+'tnip'='CATNIP'
(Other definitions for catnip that I've seen before include "Herb of the mint family, attractive to some pets" , "Strong-smelling herb" , "Felines fancy it" , "Tin cap (anag.)" , "'Hairy herb, strongly attractive to felines (6)'" .)