Possible Clues:

• Chemical substance obtainable from isocline
• Barman hides liabilities at the centre for one used by plumber
• Rubbery stuff in cake -- I only half lick the content
• Implanted material?
• Bit of a boob, perhaps, if is back on ecstasy
• Oil's nice possibly as a sort of lubricant
• Insulation and sealing material
• Polymer, used in paints and implants
• Lies in circulation about firm producing material for plumbers
• Material for some spatulas