Crossword Genius

Soldier's beer drinking exploit with Elizabeth the first (9)

Ross

I believe the answer is:

beefeater

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

'soldier's' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's a link between them I don't understand?

'beer drinking exploit with elizabeth the first' is the wordplay.
'drinking' indicates putting letters inside (inserted letters are consumed or drunk).
'exploit' becomes 'feat' (synonyms).
'with' says to put letters next to each other.
'the first' says to take the initial letters.
The initial letter of 'elizabeth' is 'e'.
'feat'+'e'='feate'
'beer' enclosing 'feate' is 'BEEFEATER'.

Can you help me to learn more?

(Other definitions for beefeater that I've seen before include "no vegetarian?" , "Tower of London guard" , "Bodyguard of the British monarch" , "royal bodyguard" , "One might guard" .)

I've seen this clue in The Guardian.
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