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Secures top place finally in decisive victory (9)

Ross

I believe the answer is:

landslide

I'm a little stuck... Click here to teach me more about this clue!

'victory' is the definition.
(I've seen this before)

'secures top place finally in decisive' is the wordplay.
I cannot quite understand how this works, but
'top' could be 'lid' (lid is a kind of top) and 'lid' is present in the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for landslide that I've seen before include "big majority" , "Movement at grass-roots level" , "Shifting of ground" , "Overwhelming success" , "Major earth movement" .)

I've seen this clue in The Hindu.
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