Crossword Genius

A table label? (3)

Ross

I believe the answer is:

tab

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

This clue might be a double definition.

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

'label?' is the second definition.
(I've seen this in another clue)

Can you help me to learn more?

(Other definitions for tab that I've seen before include "Flap; illicit drug pill (slang)" , "Ring pull" , "ticket" , "Bar tally; small flap" , "Tally at bar (colloq.)" .)

I've seen this clue in the Evening Standard.
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