Club charge is steep (8)
I believe the answer is:
macerate
'is steep' is the definition.
(both can mean to soak in a liquid)
'club charge' is the wordplay.
'club' becomes 'mace' (mace can mean a club or stick).
'charge' becomes 'rate' (rate is a kind of charge).
'mace'+'rate'='MACERATE'
(Other definitions for macerate that I've seen before include "Steep in liquid like cream tea" , "Soften food by soaking" , "Cream tea (anag) -- soften by steeping in liquid" , "Soak" .)