Luxury car transporting Yoko under a kilometre for money (6)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

K (kilometre) + ( RR [Rolls Royce; luxury car] containing [transporting] ONO [reference Yoko ONO [born 1933], Japanese multimedia artist, singer, songwriter, and peace activist, widow of John Lennon)  This being a down entry RONOR is placed under the K