Very keen, though it's torment, having a flair for (8)

I believe the answer is:

hellbent

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'very keen' is the definition.
The definition suggests an adjective which matches the answer.

'it's torment having a flair for' is the wordplay.
'it's torment' becomes 'hell'.
'having' means one lot of letters go next to another.
'a flair for' becomes 'bent' (I can't explain this - if you can you should believe this answer much more).
'hell'+'bent'='HELLBENT'

'though' is the link.

Can you help me to learn more?

(Other definitions for hellbent that I've seen before include "Dogged - persistent" , "Rashly determined" , "Recklessly intent" , "Implacably set (on)" , "Stubbornly determined, on the path to ruin?" .)

I've seen this clue in the Evening Standard.

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