Plain meal regularly selected somewhere in Peru (4)

I believe the answer is:

lima

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'in peru' is the definition.
('Lima' is part of 'peru')

'plain meal regularly selected' is the wordplay.
'regularly selected' means one should take alternating letters.
'plain'+'meal'='plainmeal'
The alternating letters of 'plainmeal' are 'LIMA'.

'somewhere' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for lima that I've seen before include "Mail to Peru's capital" , "Edible bean; capital city" , "South American capital" , "city (like 22)" , "Mail it to Peruvian city" .)

I've seen this clue in The Times.

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