State the man composed an emblematic song (8,6)
I believe the answer is:
national anthem
'an emblematic song' is the definition.
'national anthem' can be an answer for 'song' (national anthem is a kind of song). I am not sure about the 'an emblematic' bit.
'state the man composed' is the wordplay.
'state' becomes 'national' (I can't justify this - if you can you should give a lot more credence to this answer).
'composed' indicates an anagram.
'the'+'man'='theman'
'theman' is an anagram of 'anthem'.
'national'+'anthem'='NATIONAL ANTHEM'
Can you help me to learn more?
(Other definitions for national anthem that I've seen before include "The Marseillaise, perhaps" , "noted stirrer" , "Patriotic song" , "country air" , "The Star-Spangled Banner', say" .)