Using fingers, mine, I count (9)
I believe the answer is:
digitally
'using fingers' is the definition.
(I've seen this before)
'mine i count' is the wordplay.
'mine' becomes 'dig' (I've seen this before).
'count' becomes 'tally' (tallying is a kind of counting).
'dig'+'i'+'tally'='DIGITALLY'
(Other definitions for digitally that I've seen before include "how PC works" , "employing electronic equipment?" , "using fingers" .)