Beer with dirt tossed on top is well stupid (4-3)
I believe the answer is:
dumb-ass
'beer with dirt tossed on top is well' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'stupid' is the wordplay.
I cannot quite see how this works, but
'stupid' could be 'dumb' (similar in meaning) and 'dumb' is located in the answer.
The remaining letters 'ass' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for dumb-ass that I've seen is " Extremely stupid".)