Crossword Genius

What the tough old bird is wearing? (6,4)

Ross

I think it could be either:

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6,4

10*

boiler suit

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'what the' is the definition.
I can't tell whether this definition defines the answer.

'tough old bird is wearing?' is the wordplay.
'tough old bird' becomes 'boiler' (I've seen this before).
'is wearing?' becomes 'suit' (I can't explain this - if you can you should believe this answer much more).
'boiler'+'suit'='BOILER SUIT'

Can you help me to learn more?

(Other definitions for boiler suit that I've seen before include "Overall" , "Protective clothing" , "Workwear" .)

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