Happening in Minas Tirith (5)

I believe the answer is:

astir

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'happening in minas tirith' is the definition.
I can't tell whether this defines the answer.

'in minas tirith' is the wordplay.
'in' says the answer is hidden in the clue.
'ASTIR' is hidden within 'minas tirith'.

Can you help me to learn more?

(Other definitions for astir that I've seen before include "Up and about -- is art (anag)" , "Busy" , "Out of bed or on the move" , "Excitedly moving" , "Moving; out of bed" .)

I've seen this clue in The Times.

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