Spooner has macho sauce with fish (3,5)

I believe the answer is:

sea horse

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'fish' is the definition.
(sea horse is a kind of fish)

I don't understand how the remainder of the clue works.

(Other definitions for sea horse that I've seen before include "Graceful swimmer" , "Marine equine mammal" , "Upright fish; so here's a (anag.)" , "Fish, Hippocampus" , "Small fish with equine-like head." .)

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

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