Mock wedding serenade and hairstyle adopted by nervous vicar (9)

I believe the answer is:

charivari

I'm a little stuck... Click here to teach me more about this clue!

'mock wedding serenade' is the definition.
'charivari' can be an answer for 'serenade' (charivari is a kind of serenade). I am unsure of the 'mock wedding' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for charivari that I've seen before include "Noisy welcome" , "cacophony" , "racket!" , "Mock serenade" , "uproar" .)

I've seen this clue in the Sydney Morning Herald.

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