Secure a ship (4)

I think it could be either:

Which length description are you looking for?:

3,6 4*

'secure a ship' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for moor that I've seen before include "Secure boat to fixed object" , "Old North African" , "Someone like Othello" , "Heathland" , "Open upland; tie up boat" .)

I've seen this clue in the Penny Press and the Evening Standard.

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