Crossword Genius

Those fronting band include fab four hit (4)

Ross

I believe the answer is:

biff

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

'hit' is the definition.
(I know that biff is a more specific form of the action hit)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for biff that I've seen before include "Hard blow with fist" , "Punch" , "strike" .)

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