Crossword Puzzle Abacus user

Clue: Abacus user

Abacus user's goal (SUM with 3 letters)
What the part-time abacus user didn't feel like? (ATOTALFAILURE with 13 letters)
Abacus users (ADDERS with 6 letters)
Trundle bed user, perhaps (HOUSEGUEST with 10 letters)
User's fee (TOLL with 4 letters)
Passkey users (MAIDS with 5 letters)
Computer users (TYPERS with 6 letters)
Radar user (e.g. COP with 3 letters)
Legal user of another's patent (LICENSOR with 8 letters)
Cell user's question (CANYOUHEARMENOW with 15 letters)