Six-act dramas extremely rare? They’re no longer screened here (3,5)

'they're no longer screened here' is the definition.
(UK tax discs were once shown on car window screens)

'six-act dramas extremely rare?' is the wordplay.
'extremely' suggests removing the centre.
'rare?' indicates anagramming the letters (I've seen 'rare' mean this).
'dramas' with its centre taken out is 'ds'.
'six'+'act'+'ds'='sixactds'
'sixactds' anagrammed gives 'TAX DISCS'.