I tarry out of curiosity (6)
I believe the answer is:
rarity
'curiosity' is the definition.
(I know that curiosity can be written as rarity)
'i tarry out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'i'+'tarry'='itarry'
'itarry' is an anagram of 'RARITY'.
'of' is the link.
(Other definitions for rarity that I've seen before include "Uncommon item or event" , "Thinness" , "Something very scarce, probably valuable" , "something quite unusual" , "You don't see it very often" .)