Crossword Genius

Someone with book perhaps following close to street walker (7)

Ross

I believe the answer is:

treader

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

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

'someone with book perhaps following close to street' is the wordplay.
I cannot really see how this works, but
'someone' could be 'reader' (reader is a kind of someone) and 'reader' is found in the answer.
A single letter 't' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for treader that I've seen before include "Plodder" , "who goes one step at a time" .)

I've seen this clue in The Times.
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