
1) Certain TV hours 2) Evening hours 3) Evening TV viewing period 4) Evening viewing hours 5) From 8 to 11 6) Heyday 7) News preceder, often 8) TV evenings 9) Viewing period 10) Watchful hours 11) When many night visions occur 12) When most people watch tv 13) When most tv sets are on
Found on
https://www.crosswordclues.com/clue/primetime

Daypart associated with largest audiences, generally between 19.00 and 23.00, though precise times may vary slightly by country.
Found on
http://www.agbnielsen.net/glossary/glossaryQ.asp?type=alpha&jump=none
No exact match found.