Series lacks power to satisfy (4)
I believe the answer is:
sate
'to satisfy' is the definition.
(I've seen this in another clue)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for sate that I've seen before include "Fill to repletion" , "Satisfy - surfeit" , "Fulfil to excess" , "Satisfy to the full" , "Fill totally" .)