Crossword Genius

Teller loses some currency and becomes more pale (6)

Ross

I believe the answer is:

ashier

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

'more pale' is the definition.
(I've seen this in another clue)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

I've seen this clue in The Hindu.
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