Crossword Genius

The kind of varnish for a spar or pole, I see (6)

Ross

I believe the answer is:

mastic

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'the kind of varnish for a spar' is the definition.
I can't judge whether this defines the answer.

'pole i see' is the wordplay.
'pole' becomes 'mast' (mast is a kind of pole).
'see' becomes 'C' (the word for the letter, according to Chambers).
'mast'+'i'+'c'='MASTIC'

'or' acts as a link.

Can you help me to learn more?

(Other definitions for mastic that I've seen before include "Aromatic resin used to make varnish" , "Putty-like cement used as adhesive or filler" , "Resin used in varnishes" , "Gum from trees" , "Waterproof sealant" .)

I've seen this clue in the Evening Standard.
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