Ruined ice store is little-known (8)
I believe the answer is:
esoteric
'little-known' is the definition.
(I know that little-known can be written as esoteric)
'ruined ice store' is the wordplay.
'ruined' indicates anagramming the letters.
'ice'+'store'='icestore'
'icestore' anagrammed gives 'ESOTERIC'.
'is' is the link.
(Other definitions for esoteric that I've seen before include "Hard to understand" , "Tie score (anagram)" , "known to a few" , "Abstruse, obscure" , "exclusive" .)