This finds course drama school runs (5)
I believe the answer is:
radar
'this finds course' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?
'drama school runs' is the wordplay.
'drama school' becomes 'RADA' (Royal Academy of Dramatic Art).
'runs' becomes 'r' (cricket abbreviation).
'rada'+'r'='RADAR'
Can you help me to learn more?
(Other definitions for radar that I've seen before include "Pulse detection system" , "M.A.S.H. character; electronic range detector" , "System for detecting things using radio waves" , "Remote range sensor" , "Locator of plane" .)