Crossword Genius

In disrepair, old-time banners unable to be shown (14)

Ross

I believe the answer is:

indemonstrable

'unable to be shown' is the definition.
(that which cannot be demonstrated)

'in disrepair old-time banners' is the wordplay.
'in disrepair' is an anagram indicator.
'old'+'time'+'banners'='oldtimebanners'
'oldtimebanners' is an anagram of 'INDEMONSTRABLE'.

I've seen this clue in The Times.
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