In the grip of dysentery, Bluebird makes a mess (5)
I believe the answer is:
ruins
'makes a mess' is the definition.
The answer and definition can be both to do with ownership as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?
'in the grip of dysentery bluebird' is the wordplay.
I cannot really understand how this works, but
'in' is present in the answer.
The remaining letters 'rus' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for ruins that I've seen before include "Mars" , "Damaged remains (of building)" , "Remains to be seen" , "Derelict remains of building" , "Rubble" .)