A nominal subscription (9)

I believe the answer is:

signature

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

'subscription' is the definition.
(thesaurus)

I can't explain the rest of the clue.

(Other definitions for signature that I've seen before include "Mark of individuality" , "proof of identity" , "Distinctive mark" , "One's mark" , "Distinctive way of writing name" .)

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

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