Disgusting sight beyond a river (7)
I believe the answer is:
obscene
'disgusting' is the definition.
(obscene can mean disgusting or indecent)
'sight beyond a river' is the wordplay.
I cannot quite understand how this works, but
'river' could be 'ob' (Ob is an example) and 'ob' is located in the answer.
The remaining letters 'scene' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for obscene that I've seen before include "Indecent or pornographic" , "X-rated" , "Abhorrent or lewd" , "coarse!" , "Dirty" .)