Stories include school principal finding baked treat left by son (6)

I believe the answer is:

spiels

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'stories include' is the definition.
I can't judge whether this definition defines the answer.

'school principal finding baked treat left by son' is the wordplay.
'principal' says to take the initial letters (the principal letter is the first letter).
'finding' is a charade indicator (letters next to each other).
'baked treat' becomes 'pie' (I can't justify this - if you can you should give a lot more credence to this answer).
'left by' becomes 'l' (I've seen this in other clues).
'son' becomes 's' (genealogical abbreviation for son).
The initial letter of 'school' is 's'.
's'+'pie'+'l'+'s'='SPIELS'

Can you help me to learn more?

(Other definitions for spiels that I've seen before include "In slang, glib or lengthy speeches" , "Plausible glib speeches" .)

I've seen this clue in The Irish Times.

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