Turn - that is a motorcycle manoeuvre (7)
I believe the answer is:
wheelie
'a motorcycle manoeuvre' is the definition.
'wheelie' can be an answer for 'manoeuvre' (I've seen this before). I am unsure of the 'a motorcycle' bit.
'turn that is' is the wordplay.
'turn' becomes 'wheel' (I've seen this before).
'that is' becomes 'ie' (short for Latin 'id est', 'that is').
'wheel'+'ie'='WHEELIE'
Can you help me to learn more?
(Other definitions for wheelie that I've seen before include "dangerous move on bike?" , "Rider's trick" , "Manoeuvre" , "A bicycle trick and a bin" , "Biking trick" .)