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Left in charge, head for the hills (4)

Ross

I believe the answer is:

flee

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'head for the hills' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for flee that I've seen before include "Run quickly away" , "Run (from danger)" , "Take to one's heels" , "head for the hills" , "rush" .)

I've seen this clue in The Sun and The Telegraph.
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