Crossword Genius

One in 52 is frail, say (4)

Ross

I believe the answer is:

week

I'm a little stuck... Click here to teach me more about this clue!

'one in 52' is the definition.
I can't judge whether this defines the answer.

'frail say' is the wordplay.
'frail' becomes 'weak' (similar in meaning).
'say' shows a homophone (sound like).
'weak' is a homophone of 'WEEK'.

'is' is the link.

Can you help me to learn more?

(Other definitions for week that I've seen before include "Period of time; sounds like feeble" , "Seven days" , "Part of the year" , "Calendar period" , "A long time in politics?" .)

I've seen this clue in the Sydney Morning Herald.
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