Stroller to drift from front to back (6)

I believe the answer is:

ambler

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

I don't understand how the remainder of the clue works.

(Other definitions for ambler that I've seen before include "toddler?" , "Eric -, English author (The Mask of Dimitrios)" , "Eric, thriller writer" , "Writer called Eric" , "Walker who's rather slow" .)

I've seen this clue in The Hindu.

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