Head of finance department supporting gas and electricity provider (4,4)
I believe the answer is:
wind farm
'electricity provider' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'head of finance department supporting gas' is the wordplay.
'head of' indicates taking the first letters.
'department' becomes 'arm' (both can mean a division of an organisation).
'supporting' says to put letters next to each other (in a down clue, some letters go below others).
'gas' becomes 'wind' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'finance' is 'f'.
'f'+'arm'='farm'
'farm' after 'wind' is 'WIND FARM'.
'and' acts as a link.
Can you help me to learn more?
(Other definitions for wind farm that I've seen before include "Power plant that uses moving air to generate electricity" , "energy producer" , "Generating station" , "generator" , "power station" .)