Partner on TV making an instrument (7,3)
I believe the answer is:
squeeze box
'an instrument' is the definition.
(squeeze box is a kind of instrument)
'partner on tv' is the wordplay.
'partner on' becomes 'squeeze' (I can't justify this - if you can you should give a lot more credence to this answer).
'tv' becomes 'box'.
'squeeze'+'box'='SQUEEZE-BOX'
'making' acts as a link.
Can you help me to learn more?
(Other definitions for squeeze box that I've seen before include "musical instrument" , "Concertina" , "Accordion" , "Music-maker" , "producer of note" .)