When you rearrange the letters:

Dormitory – Dirty Room

Desperation – A Rope Ends It

The Morse Code – Here come Dots

Slot Machines Cash – Lost in ’em

Animosity – Is No Amity

Mother-in-law – Woman Hitler

Snooze Alarms Alas! – No More Z’s

Alec Guinness – Genuine Class

Semolina – Is No Meal

The Public Art Galleries – Large Picture Halls, I Bet

A Decimal Point – I’m a Dot in Place

The Earthquakes – That Queer Shake

Eleven plus two – Twelve plus one

Contradiction – Accord not in it

Astronomer – Moon Starer

Princess Diana – End is a Car spin