Character inclined to be kept within hospital ICU (6)
I believe the answer is:
italic
'character inclined' is the definition.
'to be kept within hospital icu' is the wordplay.
'to be kept within' indicates a hidden word.
'ITALIC' is hidden in the letters of 'hospital icu'.
(Other definitions for italic that I've seen before include "Romance is part of it" , "identifies a branch of languages?" , "Type used for stress" , "from Rome?" , "leaning over" .)