2646 : Too many (In memoriam)

The unclued lights (two of two words) comprise two celebrity pairs which are represented by a singleton, two pairs (one ‘In memoriam’) and a trio of lights .

Across

1    Slices top of sausage in front of dogs (5)

4    Traffic police with amphetamine found by small wood, reportedly (5,4)

9    City’s main Mr Big busted importing heroin (10)

11    A nobleman cut down one Oriental bean (5)

12    Nimbleness of US soldier in Italy, wandering (7)

15    Initial investigation into family line on isle (5)

16    Soprano left BBC football pundit for judge (6)

21    Gallows rebuilt by small prankster (3-5)

22    Have a rest around new lido (3,4)

24    Bleaching...