Crossword Genius

A word of praise (8)

Ross

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7

8

hosanna

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'praise' is the definition.
(I've seen this before)

'a word of' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is located in the answer.
'of' could be 'o' and 'o' is found within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for hosanna that I've seen before include "A cry of adoration to God" , "Shout of praise" , "Shout of acclamation" , "Hebrew word in the Bible, an exclamation of praise" , "exclamation of joy" .)

I've seen this clue in The Globe and Mail.
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