Primaries in Trump Age soon embody Republican shocker (5)

I believe the answer is:

taser

I'm a little stuck... Click here to teach me more about this clue!

'shocker' is the definition.
(something which gives electric shocks)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for taser that I've seen before include "A shocking thing" , "Device used to stun someone temporarily" , "Weapon firing electrified darts; stare (anag.)" , "Gun firing electrified barbs" , "Stun gun" .)

I've seen this clue in the Sydney Morning Herald.

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