Shake rattles and make people jump (7)
I believe the answer is:
startle
'jump' is the definition.
(synonyms)
'shake rattles' is the wordplay.
'shake' indicates anagramming the letters.
'rattles' anagrammed gives 'STARTLE'.
'and make people' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for startle that I've seen before include "Take unawares with rattles" , "Cause shock/alarm" , "Scare" , "Shock (someone)" , "Cause shock to" .)