Non-stop action (9,6)
I believe the answer is:
perpetual motion
'non-stop action' is the definition.
I can't tell whether this definition defines the answer.
'action' is the wordplay.
I cannot really understand how this works, but
'action' could be 'motion' (motion is a kind of action) and 'motion' is found in the answer.
The remaining letters 'perpetual' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for perpetual motion that I've seen before include "Always going" , "that keeps on going" .)