Port sacked in Ottoman push (11)

I believe the answer is:

southampton

I'm a little stuck... Click here to teach me more about this clue!

'port' is the definition.
(I've seen this before)

'sacked in ottoman push' is the wordplay.
'ottoman push' can be anagrammed to 'SOUTHAMPTON'.
However, I'm unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for southampton that I've seen before include "Mayflower starting port" , "Port in Hampshire" , "Premiership football club" , "Hampshire city" .)

I've seen this clue in The Times.

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