Isinglass (4)

I believe the answer is:

mica

'isinglass' is the definition.
(synonyms)

This is all the clue.

(Other definitions for mica that I've seen before include "Transparent mineral" , "Muscovite with perfect cleavage" , "Shiny silicate mineral" , "Semitransparent insulating mineral" , "Isinglass" .)

I've seen this clue in The Independent.

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