Crossword Genius

Land a good blow, for some reason (5)

Ross

I believe the answer is:

korea

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

'land' is the definition.
(Korea is an example)

'a good blow for some reason' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
'blow' could be 'ko' (KO is an example) and 'ko' is present in the answer.
The remaining letters 're' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for korea that I've seen before include "East Asian peninsula" , "Divided territory" , "region in Asia" , "Country (North/South)" , "Former Asian country" .)

I've seen this clue in the Evening Standard.
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