Untrustworthy person in shelter after revolution (3)
I believe the answer is:
eel
'untrustworthy person' is the definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.
'shelter after revolution' is the wordplay.
'shelter' becomes 'lee' (as in lee side, the side sheltered from wind).
'after revolution' says the letters should be written backwards (letters revolve back).
'lee' backwards is 'EEL'.
'in' is the link.
Can you help me to learn more?
(Other definitions for eel that I've seen before include "Unagi, in a sushi bar" , "Slippery character" , "Conger, e.g." , "Creature like conger or moray" , "Wriggly fish" .)