Pain of second celebrity landing outside hospital (8)
I believe the answer is:
backache
'pain' is the definition.
(I know that backache is a type of aching)
'second celebrity landing outside hospital' is the wordplay.
'second' becomes 'back' (to second a motion is to back it).
'celebrity' becomes 'ace' (both can mean a star).
'landing outside' is an insertion indicator (some words go outside others).
'hospital' becomes 'h' (abbreviation for hospital on maps).
'ace' placed around 'h' is 'ache'.
'back'+'ache'='BACKACHE'
'of' acts as a link.
(Other definitions for backache that I've seen before include "Spinal pain" , "Eg, lumbago" , "Eg, lumbar pain" , "Pain in rear of body" , "common complaint" .)