Crossword Genius

One could make a fortune with this! (5)

Ross

I believe the answer is:

tarot

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

'make a fortune with this' is the definition.
The definition suggests a singular noun which matches the answer.

'one' is the wordplay.
I cannot quite see how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is located in the answer.
The remaining letters 'trot' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'could' is the link.

Can you help me to learn more?

(Other definitions for tarot that I've seen before include "78-card pack" , "one may have been taken from deck" , "These cards are used to tell fortunes" , "Set of cards used by fortune-tellers" , "Card used for fortunetelling" .)

I've seen this clue in The Telegraph.
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