Famous liner docked — a queen (7)

I believe the answer is:

titania

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

'queen' is the definition.
(fairy queen)

'famous liner docked a' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for titania that I've seen before include "Shakespeare's queen of the fairies" , "in the D [DREAM] ..." , "Wife of Oberon (MND)" , "Oberon's queen (MND)" , "Queen of the fairies - Uranus satellite" .)

I've seen this clue in The Times.

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