Crossword Genius

Chauffeur carries rag, part of a long-standing arrangement? (7)

Ross

I believe the answer is:

statice

I'm a little stuck... Click here to teach me more about this clue!

This might be a double definition.

'chauffeur carries rag' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'part of a long-standing arrangement?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

Can you help me to learn more?

(Other definitions for statice that I've seen before include "maritime plant" , "Sea lavender" .)

I've seen this clue in The Sunday Times and The Times.
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