Cyclist ____ Armstrong (5)
I believe the answer is:
'cyclist armstrong' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lance that I've seen before include "Long, pointed weapon (5)." , "Incise" , "Shafted weapon used on horseback" , "Chap" , "Spear carried by mounted soldier" .)