Manic Monday for energetic person (6)
I believe the answer is:
dynamo
'energetic person' is the definition.
(I've seen this before)
'manic monday' is the wordplay.
'manic' indicates anagramming the letters (I've seen this in other clues).
'monday' anagrammed gives 'DYNAMO'.
'for' is the link.
(Other definitions for dynamo that I've seen before include "Forceful person" , "Electric current producer" , "It generates electricity" , "Generator of electricity (eg, on bicycle)" , "Monday (anag)" .)