Joined by crazy admirer (7)
I believe the answer is:
married
'joined' is the definition.
(similar in meaning)
'crazy admirer' is the wordplay.
'crazy' is an anagram indicator.
'admirer' with letters rearranged gives 'MARRIED'.
'by' is the link.
(Other definitions for married that I've seen before include "United, wed" , "Joined" , "Spliced" , "Admirer (anag)" , "Conjugal" .)