Rants about poetry being oblique (10)
I believe the answer is:
transverse
'being oblique' is the definition.
(thesaurus)
'rants about poetry' is the wordplay.
'about' is an anagram indicator.
'poetry' becomes 'verse' (synonyms).
'rants' anagrammed gives 'trans'.
'trans'+'verse'='TRANSVERSE'
(Other definitions for transverse that I've seen before include "Crossing" , "Cross" , "Crosswise" , "Situated across something" , "Extending across something" .)