Possible Clues:

• Tubular fluorescent light
• He leaves phenomenal spread to find illumination
• New politician unusually alone visits leading light in advertising?
• Light on panel may start flickering
• Light needs minute fitting in plan one devised
• It's for shedding light on lemon pan crumble
• Old electronic display source
• It might say 'ATM Here'
• He is excluded from design of phenomenal source of illumination
• MP on lane, disguised by gaslight