Sixes are important for the nobleman (8)

I believe the answer is:

viscount

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'the nobleman' is the definition.
(viscount is a kind of nobleman)

'sixes are important' is the wordplay.
'sixes' becomes 'VIs' ('VI' can be a synonym of 'six').
'are important' becomes 'count' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'vis'+'count'='VISCOUNT'

'for' is the link.

Can you help me to learn more?

(Other definitions for viscount that I've seen before include "Lord" , "plane" , "British peer" , "Minor peer" , "Nobleman" .)

I've seen this clue in the Sydney Morning Herald.

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