Name father turns up for an ancestor (6)
I believe the answer is:
apeman
'an ancestor' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I don't see?
'name father turns up' is the wordplay.
'father' becomes 'pa' (pa can mean dad or father).
'turns up' shows that the letters should be reversed in order.
'name'+'pa'='namepa'
'namepa' reversed gives 'APEMAN'.
'for' is the link.
Can you help me to learn more?
(Other definitions for apeman that I've seen before include "Neanderthal type?" , "Long extinct human ancestor" , "Primitive figure" , "Tarzan, for example" , "Missing link, possibly" .)