Painful condition overwhelming international winger? (4)
I believe the answer is:
ibis
'winger?' is the definition.
(ibis is a kind of bird)
'painful condition overwhelming international' is the wordplay.
'painful condition' becomes 'ibs' (I am not sure about this - if you are sure you should believe this answer much more).
'overwhelming' means one lot of letters goes inside another.
'international' becomes 'i' (abbreviation eg in IMF).
'ibs' going around 'i' is 'IBIS'.
Can you help me to learn more?
(Other definitions for ibis that I've seen before include "Large wading bird" , "Wader worshipped by ancient Egyptians" , "Flier" , "Slowly discharge" , "Near-colourless mineral" .)