Aircraft research facility turn on bore (4,6)
I believe the answer is:
wind tunnel
'aircraft' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'research facility turn on bore' is the wordplay.
I cannot really see how this works, but
'turn' could be 'wind' (I've seen this in another clue) and 'wind' is found in the answer.
'bore' could be 'tunnel' (I have seen 'Underground bore ' mean 'tunnel' so perhaps 'bore' could also mean 'tunnel') and 'tunnel' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for wind tunnel that I've seen before include "Experimental aerodynamic chamber" , "Structure for testing aircraft parts by blowing air over them" , "Airflow simulator" , "Blasted trial here" , "draughty place" .)