Fiver (3)

I think it could be either:

fin

abe

'fiver' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for fin that I've seen before include "Part of an aircraft's tail" , "Paddle-like organ" , "Aerodynamic surface" , "Piscine appendage" , "Thin projection for fish to steer itself" .)

I've seen this clue in the Penny Press, the New York Times, The Chronicle of Higher Education, the Newsday, The Washington Post, the LA Times, the Wall Street Journal and the L.A. Times Daily.

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