The tune you need if you want to inspire (3)
I believe the answer is:
air
'the tune' is the definition.
('air' can be a synonym of 'tune')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for air that I've seen before include "voice giving > impression" , "Region above the ground" , "Light breeze" , "Ventilate with oxygen" , "Publish" .)