Girl is touring Rhode Island (4)
I believe the answer is:
Here is my best explanation:
'girl' is the definition.
'is touring rhode island' is the subsidiary indication.
'touring' is an insertion indicator.
'rhode island' becomes 'ri'.
'is' going around 'ri' is 'iris'.
(Other definitions for iris that I've seen before include "Part of the eye or bright flower", "Flag - surrounding pupil", "Plant with sword-shaped leaves", "Flag or flower in the eye", "Eye part or nice flower", "Ms Murdoch", "Flowers in the eye?", "Fleur-de-lys", "Bright flower or eye part" and "Flag - flower - girl".)