Taken for granted, Penny began again (8)
I believe the answer is:
presumed
'taken for granted' is the definition.
(I've seen this before)
'penny began again' is the wordplay.
'penny' becomes 'p' (short for pence).
'began again' becomes 'resumed' (to resume is to start doing something again).
'p'+'resumed'='PRESUMED'
(Other definitions for presumed that I've seen before include "Supposed" , "Took for granted" , "thought" , "Taken for granted" , "expected" .)