Schedule for lightweight: yours truly! (9)
I believe the answer is:
programme
'schedule' is the definition.
(programming is a kind of scheduling)
'for lightweight yours truly' is the wordplay.
'for' becomes 'pro' (I've seen this before).
'lightweight' becomes 'gram'.
'yours truly' becomes 'me'.
'pro'+'gram'+'me'='PROGRAMME'
(Other definitions for programme that I've seen before include "Scheduled plan" , "Schedule of events" , "Menu of events" , "Radio or TV broadcast" , "Radio or TV show" .)