Captain's log anonymously inscribed with memorable phrase (6)

I believe the answer is:

slogan

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'memorable phrase' is the definition.
'slogan' can be an answer for 'phrase' (thesaurus). I am unsure of the 'memorable' bit.

'captain's log anonymously inscribed with' is the wordplay.
'with' indicates a hidden word.
'SLOGAN' is hidden within 'captains log anonymously inscribed'.

Can you help me to learn more?

(Other definitions for slogan that I've seen before include "Shibboleth" , "Catchy phrase in advertisement etc" , "'Motto, watchword (6)'" , "Memorable advertising phrase" , "Advertising catchphrase" .)

I've seen this clue in The Irish Times.

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