Crossword Genius

Assurance in battle-cry (7)

Ross

I believe the answer is:

warrant

'assurance' is the definition.
(warrant is a kind of assurance)

'battle-cry' is the wordplay.
'battle' becomes 'war' (I've seen this before).
'cry' becomes 'rant' (I've seen this in other clues).
'war'+'rant'='WARRANT'

'in' is the link.

(Other definitions for warrant that I've seen before include "Call for" , "Guaranty - authorisation to make an arrest" , "Justify; authorisation" , "Merit, justify" , "Guarantee" .)

I've seen this clue in The Hindu.
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