Crossword Genius

"The lady ain't for turning" - the initial form of Thatcher's mantra (4)

Ross

I believe the answer is:

tina

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'the lady' is the definition.

'ain't for turning the initial form of thatcher's mantra' is the wordplay.
'ain't' anagrams to 'TINA'.
Though, I am not clear how the anagram is indicated.

Can you help me to learn more?

(Another definition for tina that I've seen is " Ain't this a girl?".)

I've seen this clue in The Independent.
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