Crossword Genius

Pedestrian speaker makes head go woozy primarily (6)

Ross

I believe the answer is:

walker

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

'pedestrian' is the definition.
(I know that pedestrian can be written as walker)

'speaker makes head go woozy primarily' is the wordplay.
I cannot really see how this works, but
'go' could be 'walk' (walking is a kind of going) and 'walk' is found in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for walker that I've seen before include "Rambler" , "One going on foot" , "Pedestrian" .)

I've seen this clue in The Independent.
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