One apt to troll milliner half-heartedly (5)

I believe the answer is:

hater

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'one apt to troll' is the definition.
I can't judge whether this defines the answer.

'milliner half-heartedly' is the wordplay.
'milliner' becomes 'hatter' (synonyms).
'half' means to take half the letters.
'heartedly' becomes 'er' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'hatter' cut in half is 'hat'.
'hat'+'er'='HATER'

Can you help me to learn more?

(Other definitions for hater that I've seen before include "Unpleasant type" , "Antipathetic type" , "One loathing" , "One who shows intense dislike" , "Person showing animosity" .)

I've seen this clue in The Independent.

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