Brave Latvian doctor (7)

I believe the answer is:

valiant

'brave' is the definition.
(similar in meaning)

'latvian doctor' is the wordplay.
'doctor' is an anagram indicator.
'latvian' is an anagram of 'VALIANT'.

(Other definitions for valiant that I've seen before include "Dauntless" , "Doughty" , "Brave in battle" , "Latvian (anag.)" , "Brave - resolute" .)

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

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