Boldly approach a power charge (6)
I believe the answer is:
accost
'boldly approach' is the definition.
(I've seen this before)
'a power charge' is the wordplay.
'a power' becomes 'AC' (AC is an example).
'charge' becomes 'cost' (I've seen this in another clue).
'ac'+'cost'='ACCOST'
(Other definitions for accost that I've seen before include "Approach and address boldly" , "Approach boldly and speak to" , "Approach boldly or insolently" , "Stop and pester" , "Make bold approach to" .)