The ratings are misleading: fix what's bent (10)

I believe the answer is:

straighten

I'm a little stuck... Click here to teach me more about this clue!

'fix what's bent' is the definition.
I can't tell whether this definition defines the answer.

'the ratings are misleading' is the wordplay.
'are misleading' indicates an anagram (I've seen this in other clues).
'the'+'ratings'='theratings'
'theratings' is an anagram of 'STRAIGHTEN'.

Can you help me to learn more?

(Other definitions for straighten that I've seen before include "Get in line" , "Remove bends from (something)" , "Adjust" , "put in alignment?" , "Shattering (anag) - unbend" .)

I've seen this clue in The Guardian.

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