Energetic type taking Monday off (6)
I believe the answer is:
dynamo
'energetic type' is the definition.
(an energetic person)
'monday off' is the wordplay.
'off' indicates anagramming the letters.
'monday' is an anagram of 'DYNAMO'.
'taking' acts as a link.
(Other definitions for dynamo that I've seen before include "Tirelessly energetic type" , "Power source" , "Electric current producer" , "Electricity generator: all-action type" , "Electric current generator" .)