Finally fed such a man here? (6)
I believe the answer is:
dinner
'a man here?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'finally fed such' is the wordplay.
'finally' suggests the final letters.
'such' becomes 'inner' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The final letter of 'fed' is 'd'.
'd'+'inner'='DINNER'
(Other definitions for dinner that I've seen before include "serving in 20 [MESS] ?" , "What feeds" , "Eat it in the strange red inn" , "grub" , "Main meal of day" .)