Crossword Genius

Frontier family of sisters advance steadily (5)

Ross

I believe the answer is:

march

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'frontier' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for march that I've seen before include "Proceed in procession" , "Protest; month" , "Month, piece of music" , "Walk smartly" , "Walk in a resolute manner" .)

I've seen this clue in The Times.
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