Crossword Genius

Special treat, then, is very poor (5-4)

Ross

I believe the answer is:

tenth-rate

'very poor' is the definition.
(I've seen this before)

'special treat then' is the wordplay.
'special' indicates anagramming the letters.
'treat'+'then'='treatthen'
'treatthen' anagrammed gives 'TENTH-RATE'.

'is' is the link.

I've seen this clue in The Telegraph.
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