Biblical figure keen to follow God ultimately (5)
I believe the answer is:
david
'biblical figure' is the definition.
(Old Testament figure)
'keen to follow god ultimately' is the wordplay.
'keen' becomes 'avid' (both can mean enthusiastic).
'to follow' says to put letters next to each other (some letters go after or follow others).
'ultimately' says to take the final letters.
The last letter of 'god' is 'd'.
'avid' put after 'd' is 'DAVID'.
(Other definitions for david that I've seen before include "The Psalmist" , "Man's name" , "Camp" , "friend of Jonathan's?" , "- Copperfield (Dickens)" .)