Penny replaced one percent RRP nominal fee (10,4)

I believe the answer is:

peppercorn rent

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

'penny replaced one percent rrp' is the wordplay.
'penny' becomes 'p' (short for pence).
'replaced' is an anagram indicator.
'one'+'percent'+'rrp'='onepercentrrp'
'onepercentrrp' anagrammed gives 'eppercornrent'.
'p'+'eppercornrent'='PEPPERCORN RENT'

Can you help me to learn more?

(Other definitions for peppercorn rent that I've seen before include "nominal charge" , "cost of cheap accommodation" .)

I've seen this clue in The Independent.

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