Originally came here to get treatment for foot (7)

I believe the answer is:

trochee

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'for foot' is the definition.
(trochee is a kind of foot)

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

(Other definitions for trochee that I've seen before include "Long-short foot in poetry" , "Long-short metrical foot" , "Foot of a stressed and an unstressed syllable" , "Long-short metric foot" , "To cheer about this metrical unit" .)

I've seen this clue in The Guardian.

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