Possible Clues:

• An old poet played slowly
• Tempo faster than larghetto
• Not only post, presumably, that’s slow
• Play moderately slowly with stake money
• An Italian poet that's rather slow
• 'Like this, play is slow and previous (7)'
• Not quite 13 together with advance payment
• Musical instruction provided by an Italian poet
• (Of tempo) moderately slow
• Ace and ten, perhaps, to be deliberately played