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Thirteen cooks do a form of Buddhism (6,5)

Ross

I believe the answer is:

bakers dozen

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'thirteen' is the definition.
(synonyms)

'cooks do a form of buddhism' is the wordplay.
'cooks' becomes 'bakers' (I can't explain this - if you can you should believe this answer much more).
'a form of buddhism' becomes 'zen' (I've seen this before).
'bakers'+'do'+'zen'='BAKERS DOZEN'

Can you help me to learn more?

(Other definitions for bakers dozen that I've seen before include "It might be a bloomer" , "Unlucky number of loaves?" , "Additional fare here" , "Thirteen loaves?" , "13" .)

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