Squeeze-box (9)
I believe the answer is:
accordion
'squeeze-box' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for accordion that I've seen before include "Cad I croon about a musical instrument" , "Agreement starts the musical instrument" , "squeeze it while operating keys" , "Bellows-operated instrument" , "box-shaped musical instrument like melodeon" .)