Popular and uncomplaining chap on hospital ward (9)
I believe the answer is:
inpatient
'chap on hospital ward' is the definition.
(inpatients are in hospital)
'popular and uncomplaining' is the wordplay.
'popular' becomes 'in' ('in' can mean trendy).
'and' means one lot of letters go next to another.
'uncomplaining' becomes 'patient' (waiting without complaining).
'in'+'patient'='INPATIENT'
(Other definitions for inpatient that I've seen before include "hospital visitor" , "resident in ward" .)