Couple from Bangkok, did you say? (3)
I believe the answer is:
tie
'couple' is the definition.
(both can mean to join)
'from bangkok did you say?' is the wordplay.
'from bangkok' becomes 'Thai' (Bangkok is in Thailand).
'did you say?' indicates a 'sounds like' (homophone) clue.
'thai' is a homophone of 'TIE'.
(Other definitions for tie that I've seen before include "Bond > girl wearing this? Unlikely" , "Secure - draw" , "Bind; knot" , "It's worn under the collar" , "Fasten; draw" .)