Quiet fool in sandy area turned and entered forbidden territory (10)
I believe the answer is:
'entered forbidden territory' is the definition.
The answer and definition can be both to do with motion as well as being past participle verbs.
Maybe there's an association between them I don't understand?
'quiet fool in sandy area turned' is the wordplay.
'quiet' becomes 'p' (music symbol for 'piano', ie soft or quiet).
'fool' becomes 'ass' (both can mean a stupid person).
'in' is an insertion indicator.
'sandy area' becomes 'desert' (desert is a kind of area. I am not sure about the 'sandy' bit.).
'turned' is a reversal indicator.
'desert' reversed gives 'tresed'.
'pass' going into 'tresed' is 'TRESPASSED'.
'and' is the link.
Can you help me to learn more?
(Another definition for trespassed that I've seen is " had no right to be there".)