Rash having invaded us violently (9)

I believe the answer is:

unadvised

'rash' is the definition.
('unadvised' can be similar in meaning to 'rash')

'invaded us violently' is the wordplay.
'violently' indicates anagramming the letters.
'invaded'+'us'='invadedus'
'invadedus' is an anagram of 'UNADVISED'.

'having' acts as a link.

I've seen this clue in The Telegraph.

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