Crossword Genius

What the tough old bird is wearing?

Ross

I think it could be either:

Which length description are you looking for?:

6,4

10*

boilersuit

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'what the' is the definition.
I can't judge 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 am not sure about this - if you are sure you should believe this answer much more).
'boiler'+'suit'='BOILERSUIT'

Can you help me to learn more?

(Another definition for boilersuit that I've seen is " Overalls".)

I've seen this clue in the Evening Standard.
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