Uncritical admirer I swindle afterwards (8)
I believe the answer is:
idolater
'uncritical admirer' is the definition.
'idolater' can be an answer for 'admirer' (I've seen this before). I'm not sure about the 'uncritical' bit.
'i swindle afterwards' is the wordplay.
'swindle' becomes 'do'.
'afterwards' becomes 'later' (synonyms).
'i'+'do'+'later'='IDOLATER'
Can you help me to learn more?
(Other definitions for idolater that I've seen before include "Person who worships graven images" , "devotee" , "One worshipping graven image" , "Heathen" , "No orthodox believer" .)