Crossword Puzzle Locus of activity

Clue: Locus of activity

Office activity (FAXING with 6 letters)
Protest activity for ANWR drilling proponents against EPA officials? (SNOWBALLING with 11 letters)
Post office activity, or a hint to this puzzle's theme (LETTERSORTING with 13 letters)
Performs in the office pool (TYPES with 5 letters)
Dealer's offer (ROADTEST with 8 letters)
Start of an office quip (e.g. ACLEANDESK with 10 letters)
Offshore rock (ISLET with 5 letters)
Offender, maybe (BOOR with 4 letters)
Office workstations, maybe (ELLS with 4 letters)
W offerings (ROOMS with 5 letters)