Jump to give new lance a dust (6-5)
I believe the answer is:
spring-clean
'jump to give new lance a dust' is the definition.
I can't judge whether this definition defines the answer.
'jump to give new lance' is the wordplay.
'jump' becomes 'spring' (spring is a kind of jump).
'to give' means one lot of letters go next to another.
'new' indicates anagramming the letters.
'lance' is an anagram of 'clean'.
'spring'+'clean'='SPRING-CLEAN'
Can you help me to learn more?
(Other definitions for spring-clean that I've seen before include "Give (a house) a good going over" , "Annual going over of a home" .)