Crossword Genius

A solemn undertaking (6)

Ross

I believe the answer is:

pledge

'a solemn undertaking' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for pledge that I've seen before include "Deposit" , "Solemn promise" , "Covenant" , "Promise - security" , "assurance" .)

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