A word of praise (7)
'a word of praise' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alleluia that I've seen before include "Biblical exhortation of praise to the Lord" , "Shout or song in praise of God" , "Exclamation of praise" , "Liturgical shout of praise" , "Religious word to express praise or thanks" .)
'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" .)