Tight fit, television and accordion (10)
I believe the answer is:
squeezebox
'accordion' is the definition.
(I know that squeezebox is a type of accordion)
'tight fit television' is the wordplay.
'tight fit' becomes 'squeeze' (I can't justify this - if you can you should believe this answer much more).
'television' becomes 'box' ('the box' can informally mean a television).
'squeeze'+'box'='SQUEEZEBOX'
'and' is the link.
Can you help me to learn more?
(Another definition for squeezebox that I've seen is " Instrument".)