Satisfied iodine repelled object (4)
I believe the answer is:
item
'object' is the definition.
(both can mean a thing)
'satisfied iodine repelled' is the wordplay.
'satisfied' becomes 'met' (as in 'met the conditions of his contract').
'iodine' becomes 'I' (chemical symbol).
'repelled' says the letters should be written backwards.
'met'+'i'='meti'
'meti' written backwards gives 'ITEM'.
(Other definitions for item that I've seen before include "Individual object" , "Individual unit in a list" , "Boyfriend and girlfriend" , "Detail - entry" , "Feature" .)