Look good with jousting weapon (6)
I believe the answer is:
glance
'look' is the definition.
(glance is a kind of look)
'good with jousting weapon' is the wordplay.
'good' becomes 'g' (abbreviation).
'with' means one lot of letters go next to another.
'jousting weapon' becomes 'lance' (I've seen this before).
'g'+'lance'='GLANCE'
(Other definitions for glance that I've seen before include "it has a metallic lustre" , "A dart of the eye" , "oblique movement" , "Look quickly at -- cricket stroke" , "Give a quick look" .)