Exquisite crackers - three each left (8)
I believe the answer is:
ethereal
'exquisite' is the definition.
(I've seen this before)
'crackers three each left' is the wordplay.
'crackers' indicates an anagram (informal term for mad).
'each' becomes 'ea'.
'left' becomes 'l' (common abbreviation).
'three' with letters rearranged gives 'ether'.
'ether'+'ea'+'l'='ETHEREAL'
(Other definitions for ethereal that I've seen before include "Impalpable" , "Insubstantial or not of this world" , "Light, airy or spirit-like" , "Insubstantial, other-worldly" , "There in lea - it looks delicate" .)