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Where Doctor Who travels occasionally (4,4,2,4)

Ross

I believe the answer is:

from time to time

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

'occasionally' is the definition.
(I've seen this in another clue)

'where doctor who travels' is the wordplay.
I cannot quite see how this works, but
'doctor' could be 'me' and 'me' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Another definition for from time to time that I've seen is " Now and then".)

I've seen this clue in The Times and The Sunday Times.
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