Army head pressing to remove leader in a country (9)

I believe the answer is:

argentina

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'country' is the definition.
(Argentina is an example)

'army head pressing to remove leader in a' is the wordplay.
'army head' becomes 'a' (I am not sure about this - if you are sure you should believe this answer much more).
'pressing' becomes 'urgent' (synonyms).
'to remove leader' means to remove the first letter.
'urgent' with its initial letter taken away is 'rgent'.
'a'+'rgent'+'in'+'a'='ARGENTINA'

Can you help me to learn more?

(Other definitions for argentina that I've seen before include "Home of the tango" , "state" , "South American country" , "An ingrate in S American country" , "part of 18 [SOUTH AMERICA]" .)

I've seen this clue in The Guardian.

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