ER's namesake's one sadly unrecognisable after bugs removed (5,5)

I believe the answer is:

ocean liner

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

'er's' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for ocean liner that I've seen before include "Queen Mary, for example" , "Craft" , "Cruise ship" .)

I've seen this clue in The Guardian.

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