Girl, for example, turning up in proverb (5)
I believe the answer is:
adage
'proverb' is the definition.
(synonyms)
'girl for example turning up' is the wordplay.
'girl' becomes 'ada' (girl's name).
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'turning up' shows that the letters should be reversed in order.
'eg' backwards is 'ge'.
'ada'+'ge'='ADAGE'
'in' acts as a link.
(Other definitions for adage that I've seen before include "Dictum" , "Saw, proverb" , "Wise old saying" , "Old saying; proverb" , "Maxim, aphorism" .)