Crossword Genius

Supports pastry with right sourdough used initially (5)

Ross

I believe the answer is:

piers

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

'supports' is the definition.
(pier is a kind of support)

'pastry with right sourdough used initially' is the wordplay.
I cannot quite understand how this works, but
'pastry' could be 'pie' (pie is a kind of pastry) and 'pie' is found within the answer.
'right' could be 'r' (common abbreviation) and 'r' is found within the answer.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for piers that I've seen before include "Jetties" , "Supports for bridge spans" , "Old ploughman" , "Landing stages" .)

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