Crossword Genius

Well turned out? Weren't lacking interest! (4)

Ross

I believe the answer is:

dull

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'lacking interest' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

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(Other definitions for dull that I've seen before include "Not exciting" , "Overcast or uninteresting" , "Matt; overcast" , "Lacklustre" , "Gloomy" .)

I've seen this clue in the Irish Times.
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