Possible Clues:

• Liberal MP is bad — without question, a disappointment.
• Moist explosive for failed attempt
• Failed explosive
• Delete current measures and start petty complaint that will fizzle out
• Anticlimax as mother and son almost retire when in lead
• Unsuccessful attempt to impress - firework won't ignite?
• Something less impressive than expected
• Unsuccessful attempt to impress with moist explosive
• Discourage a bit of satire -- it's not impressive
• Unsuccessful attempt to impress, like moist firework