Serious rubbish sadly, or time when few watch? (9,4)
I believe the answer is:
graveyard slot
'few watch?' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'serious rubbish sadly or time' is the wordplay.
'serious' becomes 'grave' (both can mean solemn).
'rubbish' indicates anagramming the letters (a poor quality or rubbish spelling of the letters).
'time' becomes 't' (abbreviation).
'sadly'+'or'='sadlyor'
'sadlyor' is an anagram of 'yardslo'.
'grave'+'yardslo'+'t'='GRAVEYARD SLOT'
'when' is the link.
Can you help me to learn more?
(Other definitions for graveyard slot that I've seen before include "when few are listening?" , "shows failing here?" , "when the number watching is at its lowest" , "Time of lowest viewing figures" .)