Story of some Yanks joining the navy (4)

I believe the answer is:

yarn

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'story' is the definition.
(synonyms)

'some yanks joining the navy' is the wordplay.
'some' becomes 'a'.
'yanks' becomes 'y' (this might be a standard abbreviation which I don't know about).
'joining' means one lot of letters go next to another.
'the navy' becomes 'RN' (abbreviation for Royal Navy).
'a' after 'y' is 'ya'.
'ya'+'rn'='YARN'

'of' is the link.

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(Other definitions for yarn that I've seen before include "Not fully credible story" , "Sham" , "Sailor's tale" , "Fabricated" , "which could unravel?" .)

I've seen this clue in the Evening Standard.

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