Unassuming (6)
'unassuming' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for humble that I've seen before include "Of modest pretensions" , "Conscious of one's shortcomings" , "Of low rank" , "beast lacking horns in the Highlands?" , "'Modest, meek (6)'" .)
'unassuming' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for modest that I've seen before include "Reserved" , "self-effacing" , "Native of Vienna" , "Humble, not pretentious or showy" , "Not conceited, unassuming" .)
(Other definitions for demure that I've seen before include "Shy, prim" , "Coy, shy" , "(Affecting to be) quiet and modest" , "Staid" , "Rather shy" .)