Crossword Genius

Jack's double is a fearsome fellow (6)


I believe the answer is:


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'a fearsome fellow' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'jack's double' is the wordplay.
'jack' becomes 'tar' (both are informal terms for sailor).
'double' indicates the doubling of some letters.
'tar' doubled is 'TARTAR'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for tartar that I've seen before include "may be hard to brush off" , "Incrustation on teeth and gums" , "ancient Mongolian" , "Sauce often accompanying fish" , "Fearsome person: kind of sauce" .)

I've seen this clue in the Evening Standard.
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