Dispatched outside — bad scene, being old (9)
I believe the answer is:
senescent
'old' is the definition.
(similar in meaning)
'dispatched outside bad scene' is the wordplay.
'dispatched' becomes 'sent' (I've seen this before).
'outside' indicates putting letters inside.
'bad' indicates an anagram.
'scene' with letters rearranged gives 'escen'.
'sent' going around 'escen' is 'SENESCENT'.
'being' acts as a link.
(Other definitions for senescent that I've seen before include "Ageing" , "characteristic of old age" , "Showing signs of age" , "Getting old" , "Showing the deterioration of age" .)