Crossword Genius

Piece of wood - or a piece of cake? (6)

Ross

I believe the answer is:

batten

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'piece of wood' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for batten that I've seen before include "Fastener for tarpaulin" , "Gain nourishment" , "Piece of timber" , "Wooden fastening strip" , "Close securely, say the hatches" .)

I've seen this clue in the Evening Standard.
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