There's just no SUBstitute for cleverness.
Sylvester, to Tweety TAT [not knitting]
It may be held at lunchtime MAYO
Something to save for a rainy day PONCHO
Navel buildup LINT [not naval]
Nile biter ASP [not nail biter]
Staples staples, briefly PCS
Iron target CREASE [I thought golf, not clothes iron]
Theme entries:
Sensational sapphire, say SUBLIMESTONE
Early 1600's threat to the English throne? KINGJAMESSUBVERSION
Pine tar? BATTINGSUBSTANCE
What a white flag indicates? COMBATSUBMISSION
Inferior salad dressing ingredient? SUBSTANDARDOIL
That, in Tijuana ESO ["Eso Beso"]
BNAI crossed with ELAL crossed with OHARAS crossed with MCNAMARA