Rockets left out for the navy in some tides (5)

I believe the answer is:

neaps

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'some tides' is the definition.
(neap is a kind of tide)

I can't explain the remainder of the clue.

(Other definitions for neaps that I've seen before include "Tides of low range" , "Less than average tidal rises and falls" , "Moon tides" .)

I've seen this clue in The Hindu.

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