Hostile, a part of poem? (6)

I believe the answer is:

averse

'hostile' is the definition.
(thesaurus)

'a part of poem?' is the wordplay.
'part of poem?' becomes 'verse' ('verse' is part of 'poem').
'a'+'verse'='AVERSE'

(Other definitions for averse that I've seen before include "Loath, reluctant" , "Hostile" , "Disinclined or reluctant" , "Not keen" , "Antipathetic" .)

I've seen this clue in The Telegraph.

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