Bella may form an attachment (5)

I believe the answer is:

label

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

'form an attachment' is the definition.
'label' can be an answer for 'form' (thesaurus). I am not sure about the 'an attachment' bit.

'bella' is the wordplay.
'bella' anagrams to 'LABEL'.
However, I am unsure how this is indicated.

'may' is the link.

Can you help me to learn more?

(Other definitions for label that I've seen before include "Means of identifying" , "Sticker" , "Mark" , "Name-tag" , "Identifying tag" .)

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

Want a hint initially instead of a full solution? Install my app