Commotion dogs British party lacking energy and swagger (7)
I believe the answer is:
bravado
'swagger' is the definition.
(I've seen this before)
'commotion dogs british party lacking energy' is the wordplay.
'commotion' becomes 'ado' (ado is a kind of commotion).
'dogs' is a charade indicator (letters next to each other) (dogs can mean follows or chases).
'british' becomes 'br' (abbreviation for British).
'party lacking energy' becomes 'av' (I can't explain this - if you can you should give a lot more credence to this answer).
'br'+'av'='brav'
'ado' after 'brav' is 'BRAVADO'.
'and' is the link.
Can you help me to learn more?
(Other definitions for bravado that I've seen before include "Unjustified assertion of confidence" , "Show of bravery" , "Vaunted courage" , "Swaggering show of false courage" , "Impressive boldness" .)