Crossword Genius

Jack, once more, is a fierce fellow (6)

Ross

I believe the answer is:

tartar

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

'a fierce fellow' is the definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'jack once more' is the wordplay.
'jack' becomes 'tar' (both are informal terms for sailor).
'once more' becomes 'tar' (I can't explain this - if you can you should believe this answer much more).
'tar'+'tar'='TARTAR'

'is' is the link.

Can you help me to learn more?

(Other definitions for tartar that I've seen before include "A sauce to go with fish" , "Hard, crusty deposit on the teeth" , "Sauce often accompanying fish" , "Deposit that forms on teeth" , "Unpleasant sort" .)

I've seen this clue in the Evening Standard.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.