This forgot it — an iceberg amidships! (7)

I believe the answer is:

titanic

'this' is the definition.
The definition and answer are not the same part of speech.

'forgot it an iceberg amidships' is the wordplay.
'amidships' indicates a hidden word (the answer is hidden amid the clue).
'TITANIC' is hidden within 'forgot it an iceberg'.

(Other definitions for titanic that I've seen before include "Of enormous size, like the stricken liner" , "Twenty one [SHIP]" , "made of metal" , "like Oceanus" , "Sunken vessel" .)

I've seen this clue in The Times.

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