Mum's Birthday Cryptic

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Across
  1. 3. Sign - really empty.
  2. 5. Soft, a cruise line, we hear.
  3. 6. Sweeper gobbled up reporter.
  4. 7. Sounds like "I'm alright, _!" Never 'eard of 'im.
Down
  1. 1. Plenty of space near this SW city.
  2. 2. Warlord ignores the Queen.
  3. 4. Confused men I aced without schooling - watch it!