Warning issued by Conservatives infiltrated by far-right movement (8)
'warning' is the definition.
(as in traffic lights)
'conservatives infiltrated by far-right movement' is the wordplay.
'conservatives' becomes 'right' (right-wing people).
'infiltrated by' is an insertion indicator.
'far-right movement' becomes 'EDL' (English Defence League).
'right' enclosing 'edl' is 'REDLIGHT'.
'issued by' is the link.
'warning' is the definition.
(I've seen this before)
'conservatives infiltrated by far-right movement' is the wordplay.
'conservatives' becomes 'right' (I've seen this in another clue).
'infiltrated by' indicates putting letters inside.
'far-right movement' becomes 'EDL' (English Defence League).
'right' going around 'edl' is 'RED-LIGHT'.
'issued by' is the link.
(Other definitions for red light that I've seen before include "Don't go through it!" , "Indication of immoral area" , "Signal not to go on!" , "Colourful district housing brothels" , "sleazy" .)