Let it be nominal (5)

I believe the answer is:

title

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

'be nominal' is the definition.
I can't judge whether this defines the answer.

'let it' is the wordplay.
'let it' anagrams to 'TITLE'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for title that I've seen before include "Name of book or lord" , "Distinctive name" , "Right of ownership" , "confers ownership" , "Appellation signifying status or function" .)

I've seen this clue in the Evening Standard.

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