Crossword Genius

A top man in the building trade (6)

Ross

I believe the answer is:

slater

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This could be a double definition.

'a top man' is the first definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'building trade' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'in the' acts as a link.

Can you help me to learn more?

(Other definitions for slater that I've seen before include "High-reaching worker perhaps" , "Roof-worker" , "Professional roof worker" , "Layer of roof slabs" , "High-up person" .)

I've seen this clue in The Globe and Mail.
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