Money one might charge incautious tourist (5)

I believe the answer is:

rhino

I believe this is a double definition.

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

'one might charge incautious tourist' is the second definition.
(a rhinoceros might charge at someone on safari)

(Other definitions for rhino that I've seen before include "endangered creature" , "Horned ungulate" , "One with a very thick skin (abbr)" , "This beast may make a charge" , "Large horned mammal" .)

I've seen this clue in The Telegraph, The Times and The Sun.

Want a hint initially instead of a full solution? Install my app