6 across
Weed
in
pig’s
ear?
(4)
Weed in pig’s ear? (4)
hints
0
checks
0
hints
The whole clue is the definition (& lit or double definition).
How the clue works
The definition is weed — slang for HASH, as in cannabis. But then pig's ear? also gets you there, since "pig's ear" is Cockney rhyming slang for a mess or muddle — which is, again, HASH. The question mark's just a wink at the cheeky double-up.