Crossword Genius

A solemn undertaking (6)

Ross

I believe the answer is:

pledge

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a solemn undertaking</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(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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