Only a sucker would drink with one (5)
I believe the answer is:
straw
'one' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'only a sucker would drink with' is the wordplay.
I cannot quite understand how this works, but
'a' is within the answer.
'with' could be 'w' (abbreviation) and 'w' is found within the answer.
The remaining letters 'str' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for straw that I've seen before include "Dried stalks for fodder" , "Dried corn stalks" , "Plant fibre used as fodder" , "Thatching material" , "Residue of threshed corn" .)