Crossword Genius

Fiercely (5,3,4)

Ross

I believe the answer is:

tooth and nail

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

This is all the clue.

(Other definitions for tooth and nail that I've seen before include "(Fight) without restraint" , "With all possible vigour" , "Fiercely" , "With the utmost vigour" , "With greatest vigour" .)

I've seen this clue in The Sunday Times, The Times, the Newsday.com, The Telegraph and the New York Times.
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