Possible Clues:

• Bit modifier
• First word of Burns's 'To a Mouse'
• Kind of hour
• So little with a ping would not be a 29 across
• Like Burns's 'tim'rous beastie'
• When tripled, cry near the end of 39-Across
• ''Just a ___ bit more''
• Like some laddies
• Tiny (Scot.)
• ''___ Geordie''