Something fishy in second completed reshuffle (5-2)

I believe the answer is:
shake-up
'reshuffle' is the definition.
The answer and definition can be both to do with contact as well as being verbs in their base form.
Maybe there's a link between them I don't understand?
'something fishy in second completed' is the wordplay.
'something fishy' becomes 'hake' (type of fish).
'in' means one lot of letters goes inside another.
'second' becomes 's' (common abbreviation).
'completed' becomes 'up' (up can mean completed or finished).
's'+'up'='sup'
'hake' going into 'sup' is 'SHAKE-UP'.
Can you help me to learn more?
(Other definitions for shake-up that I've seen before include "Drastic reorganisation" , "Fundamental change" , "A radical reorganisation" , "Big change" , "Major reorganisation" .)
