Possible Clues:

• While on the subject of what makes one a poor sap
• Stay on the large side after a fit
• A front row forward (very large) would be appropriate
• Touching article for naval officers
• It gives support, so it turns while we're on the subject
• While we're on the subject of support, so it's back
• A move not entirely relevant
• A suggestion a learner finally rejected is pertinent
• Becoming a rugby player, very big
• A forward's hogging ball? That's concerning