Declared being in favour of medical treatment (10)

I believe the answer is:

proclaimed

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

'in favour of medical treatment' is the wordplay.
'in favour of' becomes 'pro' (being pro a particular cause).
'treatment' indicates anagramming the letters (letters treated or processed differently).
'medical' with letters rearranged gives 'claimed'.
'pro'+'claimed'='PROCLAIMED'

'being' is the link.

(Another definition for proclaimed that I've seen is " Lauded".)

I've seen this clue in The Daily Express.

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