Guardian 26242

[racoony]

Please explain 2 answers.
1 across.Clue is:Pirate,having met the Queen,could be Prime Minister once.The answer is thatch.I understand the reference to Thatcher as PM and Queen for ER, but how does thatch fit with pirate?
25 down.Clue is:Fish,used creatively,fed characters going out.The answer is sushi.I see that fish is sushi, but how does it fit with characters going out?
Many thanks for help.

[dannyk13]

25d.Anagram of fish used - fed

[Valanne]

fish used - anagram minus the letters fed.

[mallyh]

25 take fed from fish used

[Oldred]

Thatch - an English pirate who operated in the Caribbean and off the Atlantic coast of North America (died in 1718)

[Baldric]

en.wikipedia.org/wiki/Blackbeard‎
Edward Teach (also Edward Thatch, c. 1680 – 22 November 1718), better known as Blackbeard, was a notorious English pirate