Instruments for playing an air on key (4)
I believe the answer is:
wind
I believe this clue is a quadruple definition!!
'instruments for' is the first definition.
'wind' can be an answer for 'instruments' (wind section of an orchestra). I'm not certain of the 'for' bit.
'playing' is the second definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'an air' is the third definition.
(thesaurus)
'on' is a link.
'key' is the fourth definition.
(thesaurus)
Can you help me to learn more?
(Other definitions for wind that I've seen before include "Air-current" , "Move on a twisting path" , "Some musicians" , "Not follow straight path" , "Meander, breeze" .)