Crossword Genius

Something unusual, 'I tarry', needs rewriting (6)

Ross

I believe the answer is:

rarity

'something unusual' is the definition.
(I've seen this before)

'i tarry needs rewriting' is the wordplay.
'needs rewriting' indicates an anagram (I've seen this in other clues).
'i'+'tarry'='itarry'
'itarry' is an anagram of 'RARITY'.

(Other definitions for rarity that I've seen before include "Unlikely event" , "Something seldom seen" , "Something uncommon" , "something quite unusual" , "Unusual item" .)

I've seen this clue in The Telegraph.
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