Crossword Genius

Swimmers emptied two glasses (4)

Ross

I believe the answer is:

togs

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

'swimmers emptied two glasses' is the definition.
I can't tell whether this defines the answer.

'emptied two glasses' is the wordplay.
'emptied' means to remove the middle letters.
'glasses' becomes 'gs' (I can't justify this - if you can you should believe this answer much more).
'two' with its middle removed is 'to'.
'to'+'gs'='TOGS'

Can you help me to learn more?

(Other definitions for togs that I've seen before include "Gear" , "garment" , "costumes [STRINE]" , "Clothes (sl.)" , "Swimsuit" .)

I've seen this clue in the Sydney Morning Herald.
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