Crossword Genius

Unit in current use (6)

Ross

I believe the answer is:

ampere

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

'unit' is the definition.
(I know that ampere is a type of electromagnetic unit)

'current use' is the wordplay.
'current' becomes 'amp' (electricity).
'use' becomes 'ere' (I can't explain this - if you can you should give a lot more credence to this answer).
'amp'+'ere'='AMPERE'

'in' is the link.

Can you help me to learn more?

(Other definitions for ampere that I've seen before include "Current measure" , "Unit of currency" , "Solenoid inventor" , "Unit of electrical current" , "Basic SI unit of electric current" .)

I've seen this clue in the Evening Standard.
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