She sang, really, about a large nation's borders (4,4)

I believe the answer is:

vera lynn

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'she sang' is the definition.
The definition suggests a singular noun which matches the answer.

'really about a large nation's borders' is the wordplay.
'really' becomes 'very' (I've seen this before).
'about' means one lot of letters goes inside another.
'large' becomes 'L' (eg in clothes sizes).
'nation's borders' becomes 'nn' (I can't justify this - if you can you should believe this answer much more).
'a'+'l'='al'
'very' placed around 'al' is 'veraly'.
'veraly'+'nn'='VERA LYNN'

Can you help me to learn more?

(Other definitions for vera lynn that I've seen before include "White Cliffs of Dover singer, b.1917" , "Singing Dame of WWII" .)

I've seen this clue in The Times.

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