Crossword Genius

Swallow one strong drink (7)

Ross

I believe the answer is:

martini

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

'strong drink' is the definition.
'martini' can be an answer for 'drink' (martini is a kind of drink). I am unsure of the 'strong' bit.

'swallow one' is the wordplay.
'swallow' becomes 'martin' (martin is a kind of swallow).
'one' becomes 'i' (Roman numeral).
'martin'+'i'='MARTINI'

Can you help me to learn more?

(Other definitions for martini that I've seen before include "Italian drink" , "Cocktail of gin and dry vermouth" , "alcoholic drink" , "obtained from a bottle" , "rifle" .)

I've seen this clue in The Times.
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