Crossword Genius

Bill picked up in mistake for a bat! (3)

Ross

I believe the answer is:

tab

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

'bill' is the definition.
(tab is a kind of bill)

'picked up in mistake for a bat' is the wordplay.
'bat' anagrams to 'TAB'.
Though, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for tab that I've seen before include "Tally at bar (colloq.)" , "Small flap - bill" , "Running bar bill" , "Kind of label for bat" , "Flap; illicit drug pill (slang)" .)

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