Old motorbikes feature thrills with skill rounding junction (9)
I believe the answer is:
kickstart
'old motorbikes feature' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'thrills with skill rounding junction' is the wordplay.
'thrills' becomes 'kicks' ('kick' can be a synonym of 'thrill').
'with' says to put letters next to each other.
'skill' becomes 'art' (both can mean a talent).
'rounding' is an insertion indicator.
'junction' becomes 't'.
'kicks'+'art'='kicksart'
'kicksart' placed around 't' is 'KICKSTART'.
Can you help me to learn more?
(Another definition for kickstart that I've seen is " A flyer".)