Crossword Genius

Annual fee concerning spirit (4)

Ross

I believe the answer is:

rego

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'annual fee' is the definition.
The definition suggests a singular noun which matches the answer.

'concerning spirit' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'spirit' becomes 'go'.
're'+'go'='REGO'

Can you help me to learn more?

(Another definition for rego that I've seen is " Some overseas car owners cannot do without this".)

I've seen this clue in the Sydney Morning Herald.
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