They suit their customers (7)

I believe the answer is:

tailors

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'customers' is the definition.
The answer and definition can be both people as well as being plural nouns.
Maybe there's a link between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for tailors that I've seen before include "They make fitted clothes" , "Designers" , "Workers" .)

I've seen this clue in The Irish News.

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