Teach poor swindle (5)
I believe the answer is:
'swindle' is the definition.
('cheat' can be a synonym of 'swindle')
'teach poor' is the wordplay.
'poor' indicates an anagram.
'teach' with letters rearranged gives 'CHEAT'.
(Other definitions for cheat that I've seen before include "Teach? (Anag)" , "Fool" , "Act dishonestly to gain an advantage" , "rook" , "Trick or swindle" .)