Knight's impaling spike? (5)
I believe the answer is:
lance
'spike?' is the definition.
(thesaurus)
'knight's impaling' is the wordplay.
I cannot quite understand how this works, but
'knight' could be 'n' (chess abbreviation) and 'n' is found within the answer.
The remaining letters 'lace' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for lance that I've seen before include "Cut open" , "corporal may have at the front" , "Shafted weapon used on horseback" , "Pointed instrument" , "A horse soldier's spear" .)