Overprotects new girl who's pictured with son (7)
I believe the answer is:
nannies
'overprotects' is the definition.
'new girl who's pictured with son' is the wordplay.
'new' becomes 'n'.
'girl who's pictured' becomes 'annie' (character in the film or 'picture' Annie).
'with' means one lot of letters go next to another.
'son' becomes 's'.
'n'+'annie'+'s'='NANNIES'
(Other definitions for nannies that I've seen before include "nursemaids" , "Children's nurses" , "She-goats" , "Child minders" , "Female goats" .)