Antagonistic presenter riles centrists (7)

I believe the answer is:

hostile

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'antagonistic' is the definition.
(similar in meaning)

'presenter riles centrists' is the wordplay.
'presenter' becomes 'host' (as in the host of a TV show).
'riles centrists' becomes 'ile' (I can't explain this - if you can you should believe this answer much more).
'host'+'ile'='HOSTILE'

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(Other definitions for hostile that I've seen before include "Inimical" , "Enemy" , "malevolent" , "Showing angry opposition" , "The soil strangely is unfriendly" .)

I've seen this clue in The Irish Times.

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