One dislikes half-hearted contributor to top fashion? (5)

I believe the answer is:

hater

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'contributor to top fashion?' is the definition.
I can't judge whether this definition defines the answer.

'one dislikes half-hearted' is the wordplay.
'one dislikes' becomes 'hate' (I can't justify this - if you can you should believe this answer much more).
'half' becomes 'first' (first half is a kind of half).
'hearted' indicates the central letters.
The central letter of 'first' is 'r'.
'hate'+'r'='HATER'

Can you help me to learn more?

(Other definitions for hater that I've seen before include "One disliking" , "I really can't stand" , "One loathing" , "One who shows intense dislike" , "Antipathetic type" .)

I've seen this clue in The Telegraph.

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