Possible Clues:

• Little water, first taken from empty sink
• Herald of St Swithun's reign might ordain priest for sacrifice
• Falling globule of water
• One of many in a shower
• Plumber finally fixed a drip on part of shower
• Unit of moisture precipitated from sky
• Deluge component
• Spot of precipitation
• One coming down
• Talk about popular doctor beginning to organise bit of a shower?