Till broken by whiskey company? (3)
I believe the answer is:
two
'company?' is the definition.
(I've seen this in another clue)
'till broken by whiskey' is the wordplay.
'till' becomes 'to' (I can't justify this - if you can you should give a lot more credence to this answer).
'broken by' is an insertion indicator (inserted letters break into the word).
'whiskey' becomes 'W' (phonetic alphabet: alpha, bravo, charlie etc.).
'to' enclosing 'w' is 'TWO'.
Can you help me to learn more?
(Other definitions for two that I've seen before include "A pair (3)" , "One plus one" , "Couple, brace" , "II" , "1 + 1" .)