Chestnut tree (3)

I believe the answer is:

bay

This clue is a double definition.

'chestnut' is the first definition.
(I've seen this in another clue)

'tree' is the second definition.
(bay is a kind of tree)

(Other definitions for bay that I've seen before include "Botany, Galway or Tampa" , "Reddish-brown horse" , "laurel maybe" , "Inlet; shrub" , "Botany or Biscay, for example" .)

I've seen this clue in The Times.

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