Suffering upset stomach - fine wine can be like that (4)
I believe the answer is:
oaky
'suffering upset stomach fine wine can' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'like that' is the wordplay.
I cannot quite understand how this works, but
'like' could be 'y' (similar in meaning) and 'y' is located in the answer.
The remaining letters 'oak' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'be' is the link.
Can you help me to learn more?
(Other definitions for oaky that I've seen before include "Firm" , "of wood here" .)