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 Chronicle of Higher Education, The Washington Post, the LA Times, the New York Times, the Newsday, the L.A. Times Daily and The Wall Street Journal.

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