Following explosion initially in light on ceiling, not flammable or inflammable (10)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

F (following) + E[xplosion] in LAMP (light) + ROOF (ceiling); flammable and inflammable mean virtually the same but Collins notes under ‘flammable’: ‘USAGE flammable and inflammable are interchangeable when used of the properties of materials. Flammable is, however, preferred for warning labels as there is less likelihood of misunderstanding (inflammable being sometimes taken to mean not flammable. Inflammable is preferred in figurative contexts: this could prove to be an inflammable situation ‘