Crossword Genius

Vessel of ale containing a third of keg (6)

Ross

I believe the answer is:

beaker

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'vessel' is the definition.
(beaker is a kind of vessel)

'ale containing a third of keg' is the wordplay.
'ale' becomes 'beer' (I've seen this before).
'containing' indicates putting letters inside.
'third of keg' becomes 'k' (I can't explain this - if you can you should give a lot more credence to this answer).
'a'+'k'='ak'
'beer' placed around 'ak' is 'BEAKER'.

'of' is the link.

Can you help me to learn more?

(Other definitions for beaker that I've seen before include "Flatbottomed drinking cup", "Wide-mouthed cup", "Plastic drinking vessel", "Glass vessel", "Mug - large glass".)

I've seen this clue in The Telegraph.
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