Prematurely terminates fake Kazakh's advance to the top (6)

I believe the answer is:

aborts

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'prematurely terminates' is the definition.
'aborts' can be an answer for 'terminates' (aborting is a kind of terminating). I'm not certain of the 'prematurely' bit.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for aborts that I've seen before include "Ends prematurely" , "Brings to premature conclusion" , "Pulls the plug on" , "Terminates prematurely or miscarries" , "Brings to premature end" .)

I've seen this clue in The Independent.

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