This old novel is stupid (7)

I believe the answer is:

doltish

'is stupid' is the definition.
(similar in meaning)

'this old novel' is the wordplay.
'novel' is an anagram indicator (letters in a new or novel order).
'this'+'old'='thisold'
'thisold' anagrammed gives 'DOLTISH'.

(Another definition for doltish that I've seen is " Dull, stupid".)

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