Support against a party is just bluster (7)

I believe the answer is:

bravado

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'just bluster' is the definition.
'bravado' can be an answer for 'bluster' (synonyms). I am not certain of the 'just' bit.

'support against a party' is the wordplay.
'support' becomes 'bra' (a support for the breasts).
'against' becomes 'v' (abbreviation for 'versus').
'party' becomes 'do' (do is a kind of party).
'bra'+'v'+'a'+'do'='BRAVADO'

'is' is the link.

Can you help me to learn more?

(Other definitions for bravado that I've seen before include "front" , "Display of confidence or daring, often boastful and insincere" , "Daring to impress" , "Unjustified assertion of confidence" , "Vaunted courage" .)

I've seen this clue in The Hindu.

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