Possible Clues:

• Snappier person coming over
• More annoyed seeing burden on monarch
• More angry footballer?
• Double-__: traitor
• Double-___ (rat)
• 'Some Kind of ___' (Dick Van Dyke comedy)
• Down word, perhaps
• Grumpier
• Treacherous person (with "double")
• More of what's in 1 and 36 across, 8 and 9 down?