CCCWC June competition voters’ comments on Clue no. 4

A clue to UNION.
2 comments refer to this clue (from 2 competitors, 0 others)

Here is the text

Comments on the clue

1.	If you could answer this clue without five checking letters you could do the 'Listener' in three seconds
2.	Clever thought , but is matter = ion ?