Foregone conclusion around peculiar poem (7)
I believe the answer is:
rondeau
'poem' is the definition.
(rondeau is a kind of poem)
'foregone conclusion around peculiar' is the wordplay.
'conclusion' indicates one should take the final letters.
'peculiar' indicates anagramming the letters.
The final letter of 'foregone' is 'e'.
'e'+'around'='earound'
'earound' is an anagram of 'RONDEAU'.
(Other definitions for rondeau that I've seen before include "Musical composition; poem of 13/15 lines" , "Type of poem" , "Style of poem" , "Sort of poem" , "Form of poem" .)