Old comedian's dance, ending in glide (4)
I believe the answer is:
hope
'old comedian's' is the definition.
(Bob Hope was a comedian)
'dance ending in glide' is the wordplay.
'dance' becomes 'hop' (hop is a kind of dance).
'ending in' suggests the final letters.
The last letter of 'glide' is 'e'.
'hop'+'e'='HOPE'
(Other definitions for hope that I've seen before include "'. . . . springs eternal in the human breast'" , "Aspiration" , "One who wrote about prisoner" , "Anticipation" , "Bob --, US comic" .)