Crossword Genius

Metropolis ultimately associated with the glass? (2,6)

Ross

I believe the answer is:

st helens

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'metropolis ultimately associated with the glass?' is the definition.
I can't tell whether this definition defines the answer.

'metropolis ultimately associated with the glass?' is the wordplay.
'ultimately' indicates one should take the final letters.
'associated with' is a charade indicator (letters next to each other).
'glass?' becomes 'lens' (I've seen this before).
The last letter of 'metropolis' is 's'.
's'+'the'+'lens'='ST HELENS'

Can you help me to learn more?

(Other definitions for st helens that I've seen before include "Place for 33 [GLASSMAKING]" , "English town" , "Town in Merseyside" , "Rugby team" .)

I've seen this clue in The Times.
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