Possible Clues:

• Too big
• Excessively big
• Played grave role in Titanic
• Too great
• Supersized, like a personality
• Concerning learner — changed gear too much
• Perhaps having consumed too much, maiden, say, spilt lager
• Gravel or rocks, last of aggregate can't be sieved?
• Description of round character on the brink, eating endless fat?
• Too big? Old hem covers most of fat