Possibly pester to get something fixed in advance (6)

I believe the answer is:

preset

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

'possibly pester to get something' is the wordplay.
'pester' anagrams to 'PRESET'.
However, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for preset that I've seen before include "Fixed in advance" , "Pester (anag.)" , "adjusted beforehand" , "ready in advance" , "Systems control" .)

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