Catch husband with parent: capital (7)
I believe the answer is:
baghdad
'capital' is the definition.
(capital of Iraq)
'catch husband with parent' is the wordplay.
'catch' becomes 'bag' (synonyms).
'husband' becomes 'h' (abbreviation).
'with' means one lot of letters go next to another.
'parent' becomes 'dad' (dad can informally mean father).
'bag'+'h'+'dad'='BAGHDAD'
(Other definitions for baghdad that I've seen before include "Iraqi capital" , "capital abroad" , "Capital of Iraq" , "city abroad" .)