Hurry and start cooking seafood (3,4,6,2)

I believe the answer is:
get ones skates on
'hurry' is the definition.
(I've seen this before)
'and start cooking seafood' is the wordplay.
I cannot really understand how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found within the answer.
'cooking' could be 'on' (I've seen this in other clues) and 'on' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for get ones skates on that I've seen before include "start cooking the fish" , "Hurry" , "prepare for Winter Olympics event?" , "shift" .)
