Driving dangerously in Sierra? Only joking! (8)

I believe the answer is:

skidding

'driving dangerously' is the definition.
(as in skidding on a road)

'sierra? only joking' is the wordplay.
'sierra?' becomes 'S' (phonetic alphabet: alpha, bravo, charlie etc.).
'only joking' becomes 'kidding' (to kid is to joke).
's'+'kidding'='SKIDDING'

'in' acts as a link.

(Another definition for skidding that I've seen is " out of control".)

I've seen this clue in The Telegraph.

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