Crossword Genius

Steady at home before wearing costume (2,7)

Ross

I believe the answer is:

in uniform

I'm a little stuck... Click here to teach me more about this clue!

'wearing costume' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'steady at home' is the wordplay.
'steady' becomes 'uniform' (I've seen this before).
'at' says to put letters next to each other (I've seen this in other clues).
'home' becomes 'in' ('he's home' can mean 'he's in').
'uniform' after 'in' is 'IN UNIFORM'.

'before' is the link.

Can you help me to learn more?

I've seen this clue in The Daily Express.
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