Girl taking ages, perhaps, to make up her face (6)
I believe the answer is:
visage
'face' is the definition.
(I know that visage is a type of face)
'girl taking ages perhaps' is the wordplay.
'girl' becomes 'Vi' (short for Violet).
'taking' means one lot of letters go next to another.
'perhaps' indicates an anagram.
'ages' anagrammed gives 'sage'.
'vi'+'sage'='VISAGE'
'to make up her' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for visage that I've seen before include "Mug" , "Face, aspect" , "Clock" , "A person's face, countenance" .)