Jerk from Sweden involved in unsolicited emails (5)
I believe the answer is:
spasm
'jerk' is the definition.
(I've seen this before)
'sweden involved in unsolicited emails' is the wordplay.
'sweden' becomes 's'.
'involved in' means one lot of letters goes inside another.
'unsolicited emails' becomes 'spam' (I've seen this before. I am not sure about the 'unsolicited' bit.).
's' going into 'spam' is 'SPASM'.
'from' acts as a link.
Can you help me to learn more?
(Other definitions for spasm that I've seen before include "Pretend to have (injury)" , "Sudden muscular contraction" , "Muscle twitch" , "Painful muscle contraction" , "Involuntary muscular contraction" .)