Radical English newspaper involved in deception (6)
I believe the answer is:
leftie
'radical' is the definition.
(a left-wing person)
'english newspaper involved in deception' is the wordplay.
'english' becomes 'e' (abbreviation).
'newspaper' becomes 'ft' (Financial Times newspaper).
'involved in' indicates putting letters inside.
'deception' becomes 'lie' (I've seen this in other clues).
'e'+'ft'='eft'
'eft' going into 'lie' is 'LEFTIE'.
(Other definitions for leftie that I've seen before include "A radical (colloq.)" , "Red" , "supporter of "gauche"?" , "Person with radical tendencies (informal)" , "socialist" .)