Namely, middle tier manager finally becomes high-ranking official (6)

I believe the answer is:

vizier

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'high-ranking official' is the definition.
'vizier' can be an answer for 'official' (vizier is a kind of official). I'm not sure about the 'high-ranking' bit.

'namely middle tier manager finally' is the wordplay.
'namely' becomes 'viz' (synonyms).
'middle' means to look at the middle letters.
'finally' says to take the final letters.
The central letters of 'tier' are 'ie'.
The last letter of 'manager' is 'r'.
'viz'+'ie'+'r'='VIZIER'

'becomes' is the link.

Can you help me to learn more?

(Other definitions for vizier that I've seen before include "High-ranking official in some Muslim countries" , "Foreign official" , "Old court official" , "Sultan's chief minister" , "Former Muslim official" .)

I've seen this clue in The Irish Times.

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