Drop of salt water, not right for drink (3)
I believe the answer is:
tea
'for drink' is the definition.
(tea is a drink)
'drop of salt water not right' is the wordplay.
'drop of' becomes 't' (I am not sure about this - if you are sure you should believe this answer much more).
'salt water' becomes 'tear' (a teardrop contains salt).
'not' indicates named letters should be taken away.
'right' becomes 'rt' (abbreviation as in Rt Hon- the Right Honourable).
'tear' with 'rt' removed is 'ea'.
't'+'ea'='TEA'
Can you help me to learn more?
(Other definitions for tea that I've seen before include "bush" , "Refresher course" , "Popular drink" , "tips for the cup?" , "leaves much to be desired?" .)