Shirley Temple part of 'mostly dull girl (9)
I believe the answer is:
grenadine
'shirley temple' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'part of 'mostly dull girl' is the wordplay.
I cannot quite see how this works, but
'part' could be 're' (re is a kind of part) and 're' is found within the answer.
'girl' could be 'nadine' and 'nadine' is found within the answer.
A single letter 'g' remains which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for grenadine that I've seen before include "material" , "Cordial made from pomegranates" , "Pomegranate cordial" , "silk fabric" , "Pomegranate juice syrup" .)