French singer returned after third of August (6)

I believe the answer is:

gallic

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

I cannot understand how the rest of the clue works.

(Other definitions for gallic that I've seen before include "Characteristic of the French" , "Pertaining to France" , "Of the French/France" , "Like certain wars" , "Typically French or of France" .)

I've seen this clue in The Independent.

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