Heading away from capital on motorway, they get the shakes (7)
I believe the answer is:
maracas
'shakes' is the definition.
Although both the answer and definition are plural nouns, I can't understand how one could define the other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for maracas that I've seen before include "they'll be shaken" , "Spanish percussion instruments" , "Mascara for the Spanish instruments" , "Handheld percussion instruments" , "Shaken instruments" .)