Crossword Genius

Large drink a chap gets columnist who goes both ways? (6,5)

Ross

I believe the answer is:

double agent

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

'columnist who goes both ways?' is the definition.
The definition and answer can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?

'large drink a chap' is the wordplay.
'large drink' becomes 'double' (drink with a double shot).
'chap' becomes 'gent' (I've seen this in other clues).
'double'+'a'+'gent'='DOUBLE AGENT'

'gets' acts as a link.

Can you help me to learn more?

(Other definitions for double agent that I've seen before include "AA man?" , "Treacherous spy" .)

I've seen this clue in The Independent.
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