Crossword Genius

Mask partner's striking spectacles from assembled onlookers (7)

Ross

I believe the answer is:

snorkel

I'm a little stuck... Click here to teach me more about this clue!

This clue might be a double definition.

'mask partner's striking' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'spectacles from assembled onlookers' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

Can you help me to learn more?

(Other definitions for snorkel that I've seen before include "Surface breathing tube" , "(Semi-)underwater breathing apparatus" , "Diver's breathing tube" , "diving equipment?" , "Breathing device for swimmers" .)

I've seen this clue in The Independent.
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