It's decorative, possibly of stone (7)

I believe the answer is:

festoon

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'it's decorative' is the definition.
I can't tell whether this definition defines the answer.

'possibly of stone' is the wordplay.
'possibly' indicates anagramming the letters.
'of'+'stone'='ofstone'
'ofstone' anagrammed gives 'FESTOON'.

Can you help me to learn more?

(Other definitions for festoon that I've seen before include "Decoration" , "Decorative chain" , "Ornamental chain/garland" , "Hung garland" , "Decorate with hanging ornaments" .)

I've seen this clue in the Evening Standard.

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