Gelatine is in drinking vessel (9)

I believe the answer is:

isinglass

'gelatine' is the definition.
(I've seen this before)

'is in drinking vessel' is the wordplay.
'drinking vessel' becomes 'glass' (I've seen this before).
'is'+'in'+'glass'='ISINGLASS'

(Other definitions for isinglass that I've seen before include "Fish product used in brewing" , "Gelatinous substance from sturgeons" , "Mineral" , "fish produce" , "One transparent material" .)

I've seen this clue in The Independent.

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