Having nothing on except end of programme (4)
I believe the answer is:
bare
'having nothing on' is the definition.
(having no clothes on)
'except end of programme' is the wordplay.
'except' becomes 'bar' ().
'end of' suggests the final letters.
The last letter of 'programme' is 'e'.
'bar'+'e'='BARE'
(Other definitions for bare that I've seen before include "Uncovered - unfurnished - unadorned" , "State of deciduous tree in winter" , "Mere" , "Unclad" , "Naked or empty" .)