Crossword Genius

Insult taking President for second oath (6)

Ross

I believe the answer is:

pledge

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

I cannot understand how the remainder of the clue works.

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(Other definitions for pledge that I've seen before include "Vow; security" , "Covenant" , "Promise, oath" , "Bond" , "Solemn undertaking" .)

I've seen this clue in The Hindu.
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