Secret ice store is in pieces (8)
I believe the answer is:
esoteric
'secret' is the definition.
(similar in meaning)
'ice store is in pieces' is the wordplay.
'is in pieces' indicates anagramming the letters.
'ice'+'store'='icestore'
'icestore' is an anagram of 'ESOTERIC'.
(Other definitions for esoteric that I've seen before include "Intelligible only to the initiated" , "Private, confined to a select group" , "Mystic" , "Understood by only a few people" , "exclusive" .)