To join one goes to the capital of England (5)
'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" .)
'to join' is the definition.
(I know that unite is a kind of fall in)
'one goes to the capital of england' is the wordplay.
'one' becomes 'unit' (synonyms).
'goes to' is a charade indicator (letters next to each other).
'the capital of' says to take the initial letters.
The first letter of 'england' is 'e'.
'unit'+'e'='UNITE'
(Other definitions for unite that I've seen before include "Bring together, become one" , "Put together" , "fuse" , "pool resources" , "Connect" .)