Genuine article backing Conservative cut (4)
I believe the answer is:
echt
'genuine' is the definition.
(echt means genuine or authentic)
'article backing conservative cut' is the wordplay.
'article' becomes 'the' (the definite article in English).
'backing' shows that the letters should be reversed in order.
'conservative' becomes 'C' (UK political abbreviation).
'cut' means one lot of letters goes inside another (some letters cut their way into a word).
'the' in reverse letter order is 'eht'.
'eht' enclosing 'c' is 'ECHT'.
(Other definitions for echt that I've seen before include "Authentic (from German)" , "Authentic and typical" , "True" , "Really" , "Genuine (Ger.)" .)