Japan amassed holding in another country (6)

I believe the answer is:

panama

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'another country' is the definition.
'panama' can be an answer for 'country' (Panama is an example). I am not certain of the 'another' bit.

'japan amassed holding in' is the wordplay.
'in' says the answer is hidden in the clue.
'PANAMA' is hidden in the letters of 'japan amassed holding'.

Can you help me to learn more?

(Other definitions for panama that I've seen before include "Canal state; hat" , "A great canal or a straw hat" , "Hat woven from jipijapa leaves" , "Country - hat - canal - cigar" , "Central American country" .)

I've seen this clue in the Sydney Morning Herald.

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