The right decor possibly the best ever! (6)
I believe the answer is:
record
'best ever' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps you can see an association between them that I can't see?
'the right decor possibly' is the wordplay.
'the right' becomes 'r' (common abbreviation).
'possibly' indicates anagramming the letters.
'decor' anagrammed gives 'ecord'.
'r'+'ecord'='RECORD'
'the' acts as a link.
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" .)