Married, embracing endless passion? That's odd (5)
I believe the answer is:
weird
'odd' is the definition.
(thesaurus)
'married embracing endless passion?' is the wordplay.
'married' becomes 'wed' ('wed' can be similar in meaning to 'married').
'embracing' indicates putting letters inside.
'endless' means to remove the last letter.
'passion?' becomes 'ire' (I've seen this before).
'ire' with its last letter taken off is 'ir'.
'wed' going around 'ir' is 'WEIRD'.
'that's' is the link.
(Other definitions for weird that I've seen before include "Creepy" , "Strange, peculiar" , "Uncanny, bizarre" , "Rum" , "Quirky" .)