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 am 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" .)