Old Nick boards ships at anchor (5)

I believe the answer is:

satan

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

'old nick' is the definition.
(I know that old nick can be written as Satan)

'boards ships at anchor' is the wordplay.
'SATAN' is hidden within the letters.
However, I am not sure how this is indicated.

Can you help me to learn more?

(Other definitions for satan that I've seen before include "Apollyon" , "Fiend" , "Fallen archangel" , "Prince of Darkness" , "Old Nick, Lucifer or Beelzebub" .)

I've seen this clue in The Sun.

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