Emma Cryptic Crossword

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Across
  1. 2. Founder is week old PM. (7)
  2. 6. Avoid switching front of fortunate for half a grand. (4)
  3. 7. College displayed by STEM master. (4)
  4. 9. Questionable banter initially last year for a far away house! (8)
Down
  1. 1. Lengthen an essay on place to store ship's grassy area. (7)
  2. 3. Master starts foreign investigation. (2)
  3. 4. Diminish COVID hall system (4,4)
  4. 5. Right rowing implement gives publication. (4)
  5. 8. Short facial hair one might wear in college? (5)