Custom house centrally located next to sea after docking (3)

I believe the answer is:

use

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

'custom' is the definition.
(I know that use is a type of custom)

'house centrally located next to sea after docking' is the wordplay.
'USE' is hidden within the letters.
However, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for use that I've seen before include "particular church liturgy" , "Avail oneself of" , "Bring into play" , "Employ, put into service" , "Put to work" .)

I've seen this clue in The Independent.

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