Possible Clues:

• Reviews Indian music a couple of times, as it's a cultural phenomenon at The Strand
• Jelly prepared from seaweed
• Petri dish gel
• Jelly from seaweed used in medicine
• A fish coming at the double may be keeping one in motion
• Jelly - a fish reproducing itself
• How a fish comes at the double to get one in motion
• A backcloth repeatedly put on jelly
• How a fish gets one in motion at the double
• Jelly from seaweed