Crossword Genius

To join one goes to the capital of England (5)

Ross

I think it could be either:

units

unite
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'to the capital of england' is the definition.
I can't judge whether this defines the answer.

'to join one goes' is the wordplay.
'to join' says to put letters next to each other.
'one' becomes 'unit' (synonyms).
'goes' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'unit' next to 's' is 'UNITS'.

Can you help me to learn more?

(Other definitions for units that I've seen before include "Single undivided wholes" , "Single items or standard quantities" , "Apparatus similar to barbecue" , "Single parts of a whole" , "military teams" .)

I've seen this clue in The Globe and Mail.
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