Type stocking extremely bizarre water ice (6)
I believe the answer is:
sorbet
'water ice' is the definition.
(I've seen this before)
'type stocking extremely bizarre' is the wordplay.
'type' becomes 'sort' (I've seen this before).
'stocking' means one lot of letters goes inside another ('stock' can mean 'carry' or 'contain').
'extremely' suggests removing the centre.
'bizarre' with its middle taken out is 'be'.
'sort' placed around 'be' is 'SORBET'.
(Other definitions for sorbet that I've seen before include "A flavoured water-ice served between courses" , "Mushy ice drink to cleanse the palate" , "Sherbet, water-ice" , "Fruit water-ice" , "Icy dessert" .)