Crossword Genius

Eager aunt's broken promise (9)

Ross

I believe the answer is:

guarantee

'promise' is the definition.
(guaranteeing is a kind of promising)

'eager aunt's broken' is the wordplay.
'broken' indicates an anagram.
'eager'+'aunt'='eageraunt'
'eageraunt' anagrammed gives 'GUARANTEE'.

(Other definitions for guarantee that I've seen before include "Warranty, pledge" , "security system" , "Underwrite; promise with certainty" , "Assurance, warranty" , "Something ensuring a particular outcome" .)

I've seen this clue in The Telegraph.
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