Litre with super price cut (8)
I believe the answer is:
lacerate
'cut' is the definition.
(thesaurus)
'litre with super price' is the wordplay.
'litre' becomes 'l' ('l' can be a synonym of 'litre').
'with' says to put letters next to each other.
'super' becomes 'ace' ('ace' can be a synonym of 'super').
'price' becomes 'rate' (I've seen this in other clues).
'l'+'ace'+'rate'='LACERATE'
(Other definitions for lacerate that I've seen before include "Cut or tear irregularly" , "Clear tea (anag.)" , "Slash" , "Tear or gash roughly" , "Cut, leaving jagged edges" .)