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Policeman finding sand, say, by large plant (6,5)

Ross

I believe the answer is:

copper beech

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

'large plant' is the definition.
The definition and answer can be both plants as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'policeman finding sand say' is the wordplay.
'policeman' becomes 'copper' (copper is a kind of policeman).
'finding' is a charade indicator (letters next to each other).
'sand' becomes 'beach' (sand can refer to a sandy beach).
'say' shows a homophone (sound like).
'beach' is a homophone of 'beech'.
'copper'+'beech'='COPPER BEECH'

'by' acts as a link.

Can you help me to learn more?

(Other definitions for copper beech that I've seen before include "Purplish-leaved tree" , "Never-green tree" , "Tree with purplish-brown leaves" , "Tree with dark-coloured leaves" , "Always autumn for this tree?" .)

I've seen this clue in The Mirror.
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