Crossword Genius

Lobster found on a pencil (6)

Ross

I believe the answer is:

crayon

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'a pencil' is the definition.
(I've seen this before)

'lobster found on' is the wordplay.
'lobster' becomes 'cray' (I am not sure about this - if you are sure you should believe this answer much more).
'found' says to put letters next to each other.
'cray'+'on'='CRAYON'

Can you help me to learn more?

(Other definitions for crayon that I've seen before include "Cyrano (anag)" , "drawer" , "Wax colouring stick" , "Pencil of chalk or wax" , "Writer" .)

I've seen this clue in the Sydney Morning Herald.
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