Crossword Genius

My mind as wandering shows energy and enthusiasm (8)

Ross

I believe the answer is:

dynamism

'energy and enthusiasm' is the definition.
(being dynamic or enthusiastic)

'my mind as wandering' is the wordplay.
'wandering' is an anagram indicator.
'my'+'mind'+'as'='mymindas'
'mymindas' is an anagram of 'DYNAMISM'.

'shows' is the link.

(Other definitions for dynamism that I've seen before include "Energy" , "Forcefulness" , "Full-of-energy quality" , "Pizzazz" .)

I've seen this clue in The Telegraph.
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