Crossword Genius

Small fib about some number that’s marked on the road (5,4)

Ross

I believe the answer is:

white line

'marked on the road' is the definition.

'small fib about some number' is the wordplay.
'small fib' becomes 'whitelie'.
'about' is an insertion indicator.
'some number' becomes 'n' (mathematical symbol for any number**).
'whitelie' going around 'n' is 'WHITE LINE'.

'that's' is the link.

I've seen this clue in The Times.
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