Crossword Genius

Nominally it forms a loose attachment (3-2,5)

Ross

I believe the answer is:

tie-on label

I'm a little stuck... Click here to teach me more about this clue!

'nominally it' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'a loose attachment' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
'attachment' could be 'tie' (I've seen this in another clue) and 'tie' is located in the answer.
This explanation may well be incorrect...

'forms' is the link.

Can you help me to learn more?

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