Song in honour of Suleyman the Magnificent (6)
I believe the answer is:
anthem
'song in honour' is the definition.
'anthem' can be an answer for 'song' (anthem is a kind of song). I am not sure about the 'in honour' bit.
'of suleyman the magnificent' is the wordplay.
'of' says the answer is hidden in the clue.
'ANTHEM' is hidden in the letters of 'suleyman the magnificent'.
Can you help me to learn more?
(Other definitions for anthem that I've seen before include "National hymn" , "National or religious song" , "National or church song" , "Choral work" , "National melody" .)