Crossword Genius

You need to be careful when one charges you money (5)

Ross

I believe the answer is:

rhino

I believe this is a double definition.

'you need to be careful when one charges you' is the first definition.
(rhinos charge at things)

'money' is the second definition.
(old-fashioned slang term for money)

(Other definitions for rhino that I've seen before include "When provoked, one may charge" , "Endangered species of large horned herbivore" , "Stumpy" , "Fierce beast (abbr.)" , "Horned pachyderm" .)

I've seen this clue in The Times.
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