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Be derisive in a letter to a relative (5)

Ross

I believe the answer is:

taunt

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'be derisive in' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'a letter to a relative' is the wordplay.
'a letter' becomes 't' (**).
'to a relative' becomes 'aunt' (aunt is a kind of relative).
't'+'aunt'='TAUNT'

Can you help me to learn more?

(Other definitions for taunt that I've seen before include "Bait with insulting remarks" , "Provoke; tease" , "Insult" , "Rag, goad" , "Mock, jeer" .)

I've seen this clue in the Evening Standard.
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