One way to get sick is to booze (5)
I believe the answer is:
swill
'is to booze' is the definition.
(thesaurus)
'one way to get sick' is the wordplay.
'one way to get' becomes 'sw' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sick' becomes 'ill' (synonyms).
'sw'+'ill'='SWILL'
Can you help me to learn more?
(Other definitions for swill that I've seen before include "Hogwash" , "Rinse - pig food" , "Wet pig feed" , "drink heavily" , "Refuse" .)