Possible Clues:

• Waspish matron fussing round head of department
• Caustic, as wit
• Doctor goes this way and that with Anthea not half sarcastic
• Second wild speech about Democrat is incisive
• Sharply sarcastic, as wit
• Sharp or critical (wit)
• Sharp, critical (wit)
• Waspish matron bustling about end of ward
• It's biting as Spooner's sleeping?
• Sharp (wit)