Beg for an adjustment in net rate (7)

I believe the answer is:

entreat

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'beg' is the definition.
(to entreat someone is to beg or plead)

'an adjustment in net rate' is the wordplay.
'net rate' anagrams to 'ENTREAT'.
However, I'm unsure how the anagram is indicated.

'for' is the link.

Can you help me to learn more?

(Other definitions for entreat that I've seen before include "Beg earnestly, plead with" , "Beg earnestly, implore" , "petition" , "Beg earnestly or emotionally" , "Ask (someone) anxiously" .)

I've seen this clue in The Globe and Mail.

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