Pancake left in rubbish container on island (5)
I believe the answer is:
blini
'pancake' is the definition.
(blini is a kind of pancake)
'left in rubbish container on island' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' is an insertion indicator.
'rubbish container' becomes 'bin' (rubbish bin).
'on' says to put letters next to each other.
'island' becomes 'i' (geographical abbreviation).
'l' inserted within 'bin' is 'blin'.
'blin'+'i'='BLINI'
(Other definitions for blini that I've seen before include "Russian food" , "Straw hat" , "Eastern European twenty four Ac" , "Pancakes served with sour cream" , "Small buckwheat pancake" .)