Old clubs song involving new instrument (7)
I believe the answer is:
ocarina
'instrument' is the definition.
(I know that ocarina is a type of wind)
'old clubs song involving new' is the wordplay.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'clubs' becomes 'c' (abbreviation used in card games such as bridge).
'song' becomes 'aria' (piece of music in an opera).
'involving' indicates putting letters inside.
'new' becomes 'n' (abbreviation as in New Testament NT).
'aria' going around 'n' is 'arina'.
'o'+'c'+'arina'='OCARINA'
(Other definitions for ocarina that I've seen before include "Wind instrument with a mouthpiece and finger holes" , "Terracotta wind instrument" , "Primitive wind instrument" , "source of music" , "Bird-shaped flute" .)