Crossword Genius

A charge exists for hiring them

Ross

I believe the answer is:

taxis

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'hiring them' is the definition.
I can't tell whether this defines the answer.

'a charge exists' is the wordplay.
'a charge' becomes 'tax' (tax is a kind of charge).
'exists' becomes 'is' ('be' can be a synonym of 'exist').
'tax'+'is'='TAXIS'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for taxis that I've seen before include "Cabs" , "return to right place" , "Cars with a driver for hire" .)

I've seen this clue in the Evening Standard.
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