Send up light with nothing on (7)
I believe the answer is:
lampoon
'send up' is the definition.
(thesaurus)
'light with nothing on' is the wordplay.
'light' becomes 'lamp' (lamp is a kind of light).
'with' is a charade indicator (letters next to each other).
'nothing' becomes 'O' (O resembles 0).
'lamp'+'o'+'on'='LAMPOON'
(Other definitions for lampoon that I've seen before include "Satirical personal attack" , "Written ridicule of polo man" , "Ridicule with satire" , "Make fun of" , "ridiculous scenario" .)