Majority of river current included liquid (8)
I believe the answer is:
moisture
'liquid' is the definition.
(I've seen this before)
'majority of river current included' is the wordplay.
'majority of' becomes 'most' (the majority of something means most of it).
'river' becomes 'ure' (river in Yorkshire).
'current' becomes 'I' (symbol for electric current).
'included' indicates putting letters inside.
'most'+'ure'='mosture'
'mosture' placed around 'i' is 'MOISTURE'.
(Other definitions for moisture that I've seen before include "Small amount of liquid causing dampness" , "Wetness caused by water" , "Liquid, in drops perhaps" , "Liquid in small quantity, in the air say" , "Small amount of liquid that causes dampness" .)