Like metro for transforming distance (9)

I believe the answer is:

kilometre

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

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

'like metro for transforming' is the wordplay.
'like metro' can be anagrammed to 'KILOMETRE'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for kilometre that I've seen before include "1000m" , "0.621 of a mile" , "Unit of distance" , "Measure of distance" , "Decimal distance" .)

I've seen this clue in The Daily Express.

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