Crossword Genius

Accountant foolishly hires worker dealing with money (7)

Ross

I believe the answer is:

cashier

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

'accountant' is the definition.
(thesaurus)

'foolishly hires worker dealing with money' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'hires' is 'shier' which is located in the answer.
'money' could be 'c' and 'c' is located in the answer.
A single letter 'a' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for cashier that I've seen before include "Money handler; dismiss from the forces" , "I search (anag) - dismiss from armed forces with disgrace" , "banking officer" , "One handling money" , "Dismiss; receiver and payer of money" .)

I've seen this clue in The Telegraph.
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