Asp and eel cooked like kipper? (6)
I believe the answer is:
asleep
'like kipper?' is the definition.
(I know this)
'asp and eel cooked' is the wordplay.
'and' means one lot of letters go next to another.
'cooked' indicates anagramming the letters (letters cooked into a new form).
'asp' after 'eel' is 'eelasp'.
'eelasp' with letters rearranged gives 'ASLEEP'.
(Other definitions for asleep that I've seen before include "Dead to the world" , "not paying attention" , "Elapse (anag)" , "Conked out" , "Dozing" .)