Store ice away - that's abstruse (8)
I believe the answer is:
esoteric
'abstruse' is the definition.
(I've seen this in another clue)
'store ice away' is the wordplay.
'away' is an anagram indicator (letters move away from their original places).
'store'+'ice'='storeice'
'storeice' anagrammed gives 'ESOTERIC'.
'that's' acts as a link.
(Other definitions for esoteric that I've seen before include "Cryptic" , "Occult" , "Secret, private" , "known to a few" , "Hard to understand" .)