Crossword Genius

Ends a call (5)

Ross

I believe the answer is:

tails

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This could be a double definition.

'ends' is the first definition.
(tail is a kind of end)

'a call' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

Can you help me to learn more?

(Other definitions for tails that I've seen before include "Morning coat" , "A possible fall of the pound" , "Coin-tossing call" , "Ends" , "the back of bears - bulls too" .)

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