Where weddings are concerned, the colourful bits (8)
I believe the answer is:
confetti
'where weddings' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'concerned the colourful bits' is the wordplay.
I cannot quite understand how this works, but
'concerned' could be 'on' (I've seen this in other clues) and 'on' is found within the answer.
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'are' acts as a link.
Can you help me to learn more?
(Other definitions for confetti that I've seen before include "Bits thrown at weddings" , "shower of a union?" , "Bits thrown over a newly married couple" , "Paper pieces thrown at wedding" , "Paper used at weddings" .)