Charlie upset hoarder with empty storage for crack (8)
I believe the answer is:
crevasse
'for crack' is the definition.
(crevasse is a kind of crack)
'charlie upset hoarder with empty storage' is the wordplay.
'charlie' becomes 'c' (phonetic alphabet: alpha, bravo, charlie etc.).
'upset' is a reversal indicator.
'hoarder' becomes 'saver' (I've seen this in another clue).
'with' says to put letters next to each other.
'empty' says to hollow out the word (remove centre letters).
'storage' with its centre removed is 'se'.
'saver' back-to-front is 'revas'.
'c'+'revas'+'se'='CREVASSE'
(Other definitions for crevasse that I've seen before include "opening" , "cold break" , "Sever sac (anag)" , "Deep open crack as in glacier" , "Crack in a mountain slope or a glacier" .)