Tiny, evil island placed in trap from the east (11)
I believe the answer is:
lilliputian
'tiny' is the definition.
(synonyms)
'evil island placed in trap from the east' is the wordplay.
'evil' becomes 'ill' (I've seen this in other clues).
'island' becomes 'i'.
'placed' becomes 'put' (I've seen this before).
'in' indicates putting letters inside.
'trap from the east' becomes 'lian' (I can't explain this - if you can you should give a lot more credence to this answer).
'ill'+'i'+'put'='illiput'
'illiput' put inside 'lian' is 'LILLIPUTIAN'.
Can you help me to learn more?
(Other definitions for lilliputian that I've seen before include "Tiny person (from "Gulliver's Travels")" , "Very small" .)