Possible Clues:

• Outside, stealing a kiss, going on for ages
• As always, headless duck swallowing seabird
• Always here
• Constant backing for different networks
• It's learnt anew about Eastern immortal
• Timeless Queen number in overdue return
• 'Lasting forever, unending (7)'
• Not stopping outside when sign of affection has been denied
• Lasting orders of Manning
• Ageless English bird almost everybody goes after