Jotted down: 'Tenner added on to fine' (4,4)
I believe the answer is:
took note
'jotted down' is the definition.
(noted down)
'tenner added on to fine' is the wordplay.
'tenner' becomes 'note' (ten pound banknote).
'added on' says to put letters next to each other.
'fine' becomes 'OK' (synonyms).
'to'+'ok'='took'
'note' put after 'took' is 'TOOK NOTE'.
I've seen this clue in The Guardian.
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