Joined in a Chinese wedding ceremony (5)
I believe the answer is:
sewed
'joined' is the definition.
(I've seen this before)
'in a chinese wedding ceremony' is the wordplay.
'in' says the answer is hidden in the clue.
'SEWED' is hidden within 'chinese wedding ceremony'.
(Other definitions for sewed that I've seen before include "Fastened with thread" , "Used needle and thread" , "Stitched" , "Did needlework" , "Joined" .)