Joy's husband, for example, no Romeo (7)
I believe the answer is:
Here is my best explanation:
'joy's' is the definition.
(elation is a kind of joy)
'husband for example no romeo' is the subsidiary indication.
'husband for example' becomes 'relation' (husband is a kind of relation).
'no' suggests deleting specific letters.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'relation' with 'r' taken out is 'elation'.
(Other definitions for elation that I've seen before include "Exaltation", "State of pleasure about toe-nail", "Toenail (anag) -- delight", "Ecstasy -- toenail (anag)", "Feeling of joy for it alone", "Feeling of delight, joy", "Feeling of delight or pride", "Delight, ecstasy", "Feeling of joy from toenail" and "Joy".)