Action? There I may be misplaced, being an impractical type (12)
I believe the answer is:
theoretician
'an impractical type' is the definition.
'action? there i may be misplaced' is the wordplay.
'may be misplaced' indicates anagramming the letters.
'action'+'there'+'i'='actiontherei'
'actiontherei' with letters rearranged gives 'THEORETICIAN'.
'being' is the link.
(Other definitions for theoretician that I've seen before include "Abstract thinker" , "someone who figures things out on paper?" , "I think" , "One ignoring experimentation" .)