City change direction sharply over FA ignoring fine (4)

I believe the answer is:

gaza

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'city' is the definition.
(I have seen 'Philistine city ' mean 'gaza' so perhaps 'city' could also mean 'gaza')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for gaza that I've seen before include "Palestinian city" , "Palestinian territory" , "Middle Eastern strip" , "troubled region" , "Area adjoining Egypt" .)

I've seen this clue in The Times and The Sunday Times.

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