Poem starts to read oddly, Auden being 'off'? (7)
I believe the answer is:
rondeau
'poem' is the definition.
(rondeau is a kind of poem)
'starts to read oddly auden being 'off'?' is the wordplay.
'starts to' says to take the initial letters.
'being 'off'?' indicates anagramming the letters.
The initial letters of 'read oddly' is 'ro'.
'auden' is an anagram of 'ndeau'.
'ro'+'ndeau'='RONDEAU'
(Other definitions for rondeau that I've seen before include "Form of poem" , "Short lyrical poem" , "Short poem with only two rhymes and opening words used twice as refrain" , "set of lines" , "form of music" .)