Clad like Elizabethan gent seizing uniform, the company's own (2-5)

I believe the answer is:

in-house

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'own' is the definition.
Both the definition and answer are adjectives.
Perhaps they are linked in a way I don't understand?

I don't understand how the rest of the clue works.

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(Other definitions for in-house that I've seen before include "Within a company" , "Within the organisation" .)

I've seen this clue in The Times.

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