Possible Clues:

• Job that's boring, boring and fixed at sea
• Moored and set about task
• Ron ached (anag.)
• With weight down, stuck in bed with overwhelming fatigue
• Secured routine job and set about it
• ... and work inside to have things securely fixed
• Work that's no fun inside, and going nowhere
• Joiner keeping dull job secure so?
• Ran last in