Coaster emptied fish basket (5)
I believe the answer is:
creel
'basket' is the definition.
(basket for holding fish)
'coaster emptied fish' is the wordplay.
'emptied' suggests removing the centre.
'fish' becomes 'eel' (eel is a type of fish).
'coaster' with its middle removed is 'cr'.
'cr'+'eel'='CREEL'
(Other definitions for creel that I've seen before include "Basket to hold fish" , "Basket (for a mackerel once caught?)" , "Fisherman's basket" , "lobster basket" , "Container for fish" .)