Moving, deep and nice end to Yankee anniversary (12,3)

I believe the answer is:

independence day

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'anniversary' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

'moving deep and nice end to yankee' is the wordplay.
'moving' is an anagram indicator.
'to yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'deep'+'and'+'nice'+'end'='deepandniceend'
'deepandniceend' anagrammed gives 'independenceda'.
'independenceda'+'y'='INDEPENDENCE DAY'

Can you help me to learn more?

(Other definitions for independence day that I've seen before include "Summer Holiday celebrated in the US" , "as one reaches eighteen?" , "Shot down" , "Film" .)

I've seen this clue in The Sunday Times.

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