Crossword Genius

Key amount to pay (3)

Ross

I believe the answer is:

tab

This clue is a double definition.

'key' is the first definition.
(key on a computer keyboard)

'amount to pay' is the second definition.
(as in a bar tab)

(Other definitions for tab that I've seen before include "Till bill" , "Text indent key" , "Running bar bill" , "Check" , "Ring pull" .)

I've seen this clue in The Times.
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