Bright colour worried baby (7)
I believe the answer is:
neonate
'baby' is the definition.
(medical term for a newborn child)
'bright colour worried' is the wordplay.
'bright colour' becomes 'neon' (I am not sure about this - if you are sure you should believe this answer much more).
'worried' becomes 'ate' (something worrying may eat someone up).
'neon'+'ate'='NEONATE'
Can you help me to learn more?
(Other definitions for neonate that I've seen before include "Recently born child" , "Young baby" , "Recent arrival" , "One in delivery ward" , "Being recently created" .)