Crossword Genius

One of seven, for example, grabbing a stool (8)

Ross

I believe the answer is:

saturday

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'one of seven' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'for example grabbing a stool' is the wordplay.
'for example' becomes 'say' ('say' can be used to introduce an example).
'grabbing' indicates putting letters inside.
'stool' becomes 'turd' (turd is a kind of stool).
'a'+'turd'='aturd'
'say' enclosing 'aturd' is 'SATURDAY'.

Can you help me to learn more?

(Other definitions for saturday that I've seen before include "when many are out of work" , "Ian McEwan novel about day of the week" , "24 hours" , "Jewish Sabbath" , "Part of the weekend" .)

I've seen this clue in The Guardian.
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