Having reached home, was given "not out" (3,2)
I believe the answer is:
got in
'out' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives occasionally mean the same thing.
'having reached home was given' is the wordplay.
I cannot quite see how this works, but
'reached' could be 'got' (I've seen this in another clue) and 'got' is located in the answer.
'home' could be 'in' ('he's home' can mean 'he's in') and 'in' is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
'not' acts as a link.
Can you help me to learn more?
(Another definition for got in that I've seen is " Entered".)