Crossword Genius

At home, ready for inclusion (5)

Ross

I believe the answer is:

inset

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'inclusion' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'at home ready' is the wordplay.
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'ready' becomes 'set' (similar in meaning).
'in'+'set'='INSET'

'for' is the link.

Can you help me to learn more?

(Other definitions for inset that I've seen before include "Small diagram contained by larger one" , "Picture inside a larger one" , "lesser feature" , "Small picture placed within a larger one" , "Piece put between other pieces." .)

I've seen this clue in The Mirror.
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