Throttle left out - that's odd! (7)
I believe the answer is:
strange
'that's odd' is the definition.
(I've seen this in another clue)
'throttle left' is the wordplay.
I cannot quite see how this works, but
'left' could be 'ran' (running is a kind of leaving) and 'ran' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'out' acts as a link.
Can you help me to learn more?
(Other definitions for strange that I've seen before include "Slightly odd, a bit weird" , "Curious" , "- - Fruit (song)" , "Funny" , "Different" .)