9 across
Muppet
Amin
confined
to
more
cheerful
block?
(10,5)
Muppet Amin confined to more cheerful block? (10,5)
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The definition is at the beginning of the clue.
How the clue works
The definition is Muppet — slang for a fool. BLITHER gives you "more cheerful" (comparative of blithe), and then for the second word, you've got INGOT (a block of metal) with IDI (as in Idi Amin, the dictator) confined inside it, making ING-IDI-OT.