Speak loudly to one electricity bill (6)
I believe the answer is:
accost
'speak loudly' is the definition.
'accost' can be an answer for 'speak' (thesaurus). I'm not certain of the 'loudly' bit.
'one electricity bill' is the wordplay.
'one electricity' becomes 'AC' (AC is an example).
'bill' becomes 'cost'.
'ac'+'cost'='ACCOST'
'to' acts as a link.
Can you help me to learn more?
(Other definitions for accost that I've seen before include "Waylay" , "Approach or hail boldly" , "Approach or confront boldly" , "Come up and address" , "such as a solicitor might do" .)