Shrubs for the French underground (6)

I believe the answer is:

maquis

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

'french underground' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for maquis that I've seen before include "World War Two French resistance" , "dense scrubby vegetation around the Med" , "Frenchman fighting" , "French underground force" , "underground movement" .)

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

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