Considered to tread unwarily? (5)

I believe the answer is:

rated

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'considered' is the definition.
(I've seen this in other clues)

'tread unwarily?' is the wordplay.
'tread' anagrams to 'RATED'.
However, I'm not sure how this is indicated.

'to' acts as a link.

Can you help me to learn more?

(Other definitions for rated that I've seen before include "Stormed" , "Tread (anag.)" , "Estimated the value or assigned a ranking" , "Assessed; merited" , "Was worthy of" .)

I've seen this clue in the Evening Standard.

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