Related Clues:

• Point to Nidge upset by something you'd do inconspicuously for a photograph?
• Add at the eleventh hour
• Enter carefully
• Photobomb Bono's pal from a little distance away?
• Parallel-park, e.g
• Enter by sidling
• Sidle through, say
• Enter at the last minute
• Enter with caution
• Slowly enter
• Enter unobtrusively