Jerusalem perhaps captured by Suleiman the Magnificent (6)
I believe the answer is:
anthem
'jerusalem' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'captured by suleiman the magnificent' is the wordplay.
'captured by' says the answer is hidden in the clue.
'ANTHEM' can be found hidden inside 'suleiman the magnificent'.
'perhaps' acts as a link.
Can you help me to learn more?
(Other definitions for anthem that I've seen before include "One for doomed youth" , "The man for a rousing song" , "The man for a patriotic song" , "Hymn of loyalty" , "Choral work" .)