Catch an Edith Piaf number? (5)

I believe the answer is:

seize

I believe this is a double definition.

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

'an edith piaf number?' is the second definition.
('six' in French, language of Edith Piaf)

(Other definitions for seize that I've seen before include "Grasp firmly" , "Grasp forcibly" , "Catch" , "Nobble" , "Suddenly take hold of" .)

I've seen this clue in The Times.

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