The right decor possibly the best ever! (6)

I believe the answer is:

record

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

'the best ever' is the definition.
I can't tell whether this defines the answer.

'the right decor possibly' is the wordplay.
'the right' becomes 'r' (common abbreviation).
'possibly' indicates anagramming the letters.
'decor' is an anagram of 'ecord'.
'r'+'ecord'='RECORD'

Can you help me to learn more?

(Other definitions for record that I've seen before include "The finest achievement" , "Archives, register" , "See 21" , "Highest achievement" , "Log - so far unsurpassed" .)

I've seen this clue in the Evening Standard.

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