Pitch spread in piles (5)

I believe the answer is:

spiel

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'pitch' is the definition.
(I've seen this in another clue)

'spread in piles' is the wordplay.
'piles' can be anagrammed to 'SPIEL'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for spiel that I've seen before include "Piles (anag.)" , "Plausible line of talk" , "Glib story" , "Sales pitch" , "Salesman's glib patter" .)

I've seen this clue in The Guardian.

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