Popular protection from precipitation (6)

I believe the answer is:

brolly

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'popular protection' is the definition.
'brolly' can be an answer for 'protection' (brolly is a kind of protection). I'm unsure of the 'popular' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for brolly that I've seen before include "Gamp" , "Cover for head" , "Portable rain-shield (abbr.)" , "Umbrella (informal)" , "What goes up when rain comes down?" .)

I've seen this clue in the Evening Standard.

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