Very different energy and skill required by staff (5,5)
I believe the answer is:
Here is my best explanation:
'very different' is the definition.
(I've seen this before)
'energy and skill required by staff' is the wordplay.
'energy' becomes 'sap' (I've seen this before).
'and' says to put letters next to each other.
'skill' becomes 'art' (I've seen this before).
'required by' is a charade indicator (letters next to each other).
'staff' becomes 'pole' (I've seen this before).
'sap' put next to 'art' is 'sapart'.
'sapart' put after 'pole' is 'POLES APART'.