Resin from a galactic source? (3)

I believe the answer is:

lac

'resin' is the definition.
(thesaurus)

'from a galactic source?' is the wordplay.
'from' says the answer is hidden in the clue.
'LAC' is hidden in the letters of 'galactic source'.

(Other definitions for lac that I've seen before include "Dark red resin - "Hotel du ___" (Anita Brookner)" , "Resinous substance an insect secretes" , "thousands from India" , "insects secrete this" , "Catalyst" .)

I've seen this clue in the Evening Standard.

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