Possible Clues:

• Distressed enemies' power reduced by old vessel
• In the main, clearer workings on minor school subject initially required
• *Computer logic game named for a warship
• Warship
• Computer game is the pits, one cries
• Classic computer game played on a grid
• Ship belonging to this person, back
• Ship takes me back across current
• *Classic PC application whose name is also a warship
• Specialized role at a coalpit?