Digger versus a Roman goddess (7)
I believe the answer is:
minerva
'roman goddess' is the definition.
(I've seen this before)
'digger versus a' is the wordplay.
'digger' becomes 'miner' (I've seen this in another clue).
'versus' becomes 'v'.
'miner'+'v'+'a'='MINERVA'
(Other definitions for minerva that I've seen before include "female of great wisdom" , "Roman goddess of crafts and wisdom - a vermin (anag)" , "wise goddess" , "embodiment of wisdom" , "Divine female" .)