Praise cuckoo flying, or leaving north (7)

'praise' is the definition.
(glorifying is a kind of praising)

'cuckoo flying or leaving north' is the wordplay.
'cuckoo' indicates anagramming the letters (I've seen this in other clues).
'leaving' suggests deleting specific letters.
'north' becomes 'n' ('N' can be a synonym of 'north').
'flying'+'or'='flyingor'
'flyingor' with 'n' removed is 'flyigor'.
'flyigor' with letters rearranged gives 'GLORIFY'.