Implement wielded by Poseidon in Greek myth (7)

I believe the answer is:

trident

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'implement' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for trident that I've seen before include "Three-pronged weapon" , "Red tint? (anagram)" , "Neptune's spear - missile" , "Weapon on submarine" , "Spear with three prongs" .)

I've seen this clue in The Times.

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