That keyed up feeling married people have? (7)
I believe the answer is:
wedlock
'that keyed up feeling' is the definition.
I can't judge whether this defines the answer.
'married people have?' is the wordplay.
'married' becomes 'wed' (wed can mean married).
'people have?' becomes 'lock' (I am not sure about this - if you are sure you should believe this answer much more).
'wed'+'lock'='WEDLOCK'
Can you help me to learn more?
(Other definitions for wedlock that I've seen before include "Marital state" , "Matrimony" , "The married state - throw away the key" , "A state of union" , "State of marriage" .)