This newborn has one neat curl (7)
I believe the answer is:
neonate
'this newborn' is the definition.
(medical term for a newborn child)
'one neat curl' is the wordplay.
'curl' indicates an anagram (I've seen 'curling' mean this (letters curl and twist out of order)).
'one'+'neat'='oneneat'
'oneneat' anagrammed gives 'NEONATE'.
'has' is the link.
(Other definitions for neonate that I've seen before include "very young child" , "Being recently created" , "Newborn baby" , "Recently born child" , "Young infant" .)