Crossword Genius

Used person in dock to trap Queen fan (10)

Ross

I believe the answer is:

accustomed

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

'used' is the definition.
(I've seen this before)

'person in dock to trap queen fan' is the wordplay.
I cannot quite understand how this works, but
'person' could be 'tom' (Tom is an example) and 'tom' is found within the answer.
The remaining letters 'accused' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for accustomed that I've seen before include "familiar" , "usual" , "Used to" .)

I've seen this clue in The Independent.
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