Denying oneself gin? Bang tea on! (10)

I believe the answer is:

abnegating

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'denying' is the definition.
(abnegating is a kind of denying)

'oneself gin? bang tea on' is the wordplay.
'gin? bang tea' can be anagrammed to 'ABNEGATING'.
Though, I am unsure how the anagram is indicated.

Can you help me to learn more?

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