So-called poet emerging from Vienna is soliciting backing (6)
I believe the answer is:
ossian
'so-called poet' is the definition.
'ossian' can be an answer for 'poet' (I have seen 'Irish poet' mean 'ossian' so perhaps 'poet' could also mean 'ossian'). I'm not sure about the 'so-called' bit.
'emerging from vienna is soliciting backing' is the wordplay.
'emerging from' indicates the answer is hidden within the clue.
'backing' shows that the letters should be reversed in order.
'naisso' is hidden within 'vienna is soliciting'.
'naisso' back-to-front is 'OSSIAN'.
Can you help me to learn more?
(Other definitions for ossian that I've seen before include "Legendary Irish poet invented in eighteenth century; is a son (anag.)" , "Fictitious Irish poet" , "Legendary Cthree Gaelic bard" , "Legendary Gaelic poet faked by Macpherson" , "Invented Irish hero" .)