Bachelor party, endless commotion and bluster (7)
I believe the answer is:
bravado
'bluster' is the definition.
(synonyms)
'bachelor party' is the wordplay.
'bachelor' becomes 'brava' (I can't justify this - if you can you should give a lot more credence to this answer).
'party' becomes 'do' (do is a kind of party).
'brava'+'do'='BRAVADO'
'endless commotion and' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for bravado that I've seen before include "Showy boldness" , "Display of confidence or daring, often boastful and insincere" , "front" , "Swag" , "showing off" .)