Crossword Puzzle Get rid of rodents

Clue: Get rid of rodents

Offshore ridge (e.g. REEF with 4 letters)
At the office Mr. Ridder _____ (BOOTEDTHECOMPUTER with 17 letters)
Rocky ridge offshore (REEF with 4 letters)
Offshore attention-getter (AHOY with 4 letters)
Amtrak ride that offers high-level math courses? (CALCULUSTRAIN with 13 letters)
Military officer's ride (STAFFCAR with 8 letters)
Rebel officer at Gettysburg (KEMPER with 6 letters)
They may offer rides (FAIRS with 5 letters)
College mil. offering (ROTC with 4 letters)
Unhelpful dictionary offering (CRCLRDFNTN with 10 letters)