Important official has opportunity to turn up (10)

I believe the answer is:

chancellor

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'important official' is the definition.
'chancellor' can be an answer for 'official' (thesaurus). I am not certain of the 'important' bit.

'opportunity to turn up' is the wordplay.
'opportunity' becomes 'chance' (synonyms).
'to turn' becomes 'roll' (roll is a kind of turn).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'roll' in reverse letter order is 'llor'.
'chance'+'llor'='CHANCELLOR'

'has' is the link.

Can you help me to learn more?

(Other definitions for chancellor that I've seen before include "Titular university head" , "Imposer of taxes" , "Govt. finance minister" , "See 8" , "11 17 down [CABINET MINISTER]" .)

I've seen this clue in the Best For Puzzles.

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