Possible Clues:

• Modelling material
• It may have its place in modelling!
• Credit card in Spain keeps the model children occupied perhaps
• In ecstasy after short film packages endure? That's the stuff of Wallace and Gromit
• Aircraft carries lots of gum and one substance used by modellers
• Marla keeps children¿s figures together in school
• Would it take its place in modelling?
• Modelling clay
• Oil-based paste mentioned in the lyrics to 'Lucy in the Sky With Diamonds'