"... by ..., row by row, gonna make this garden grow" (Garden Song) (4)

I believe the answer is:

inch

(Other definitions for inch that I've seen before include "She led the Iceni; bade ciao (anag.)" , "Crawl; imperial measurement" , "Small Scottish island" , "Creep - a very short distance" , "Creep towards < island" .)

I've seen this clue in The Irish Times.

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