Crossword Genius

Book about Tesla is gossip (6)

Ross

I believe the answer is:

tittle

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

This might be a double definition.

'book about tesla' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'gossip' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

'is' is the link.

Can you help me to learn more?

(Other definitions for tittle that I've seen before include "Smallest part (after a jot?)" , "Tiny printed mark" , "Companion to jot" , "A printed dot as in i" , "A tiny bit" .)

I've seen this clue in The Independent.
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