Crossword Genius

Bad shot of actor Tom maybe ending up on top (5)

Ross

I believe the answer is:

shank

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

'top' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for shank that I've seen before include "The shin" , "Cut of meat; leg" , "Cut of meat from lower part of foreleg" , "If red, flyer" .)

I've seen this clue in The Independent.
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