Crossword Genius

Union J has nothing against One Direction (4)

Ross

I believe the answer is:

join

'union' is the definition.
('join' can be a synonym of 'union')

'j has nothing against one direction' is the wordplay.
'has nothing' becomes 'o' (I've seen this in other clues).
'against' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral**).
'direction' becomes 'n' (N is an example).
'j'+'o'+'i'+'n'='JOIN'

(Other definitions for join that I've seen before include "Attach" , "Couple" , "make ends meet" , "ally" , "Amalgamate" .)

I've seen this clue in The Independent.
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