Dismays, admitting ecstasy is tempting (7)
I believe the answer is:
appeals
'is tempting' is the definition.
I can't judge whether this defines the answer.
'dismays admitting ecstasy' is the wordplay.
'dismays' becomes 'appals' ('appal' can be a synonym of 'dismay').
'admitting' is an insertion indicator (admit can mean to welcome in or accept).
'ecstasy' becomes 'E' (informal term for the drug).
'appals' placed around 'e' is 'APPEALS'.
Can you help me to learn more?
(Other definitions for appeals that I've seen before include "Makes earnest request" , "Urgent requests" , "Requests earnestly" , "Earnest requests" , "Heartfelt requests" .)