Infrequently see Larry move with energy (6)
I believe the answer is:
rarely
'infrequently' is the definition.
(I've seen this before)
'larry move with energy' is the wordplay.
'move with' indicates anagramming the letters.
'energy' becomes 'e' (physics symbol as in E=mc2).
'larry' anagrammed with 'e' makes 'RARELY'.
'see' is the link.
(Other definitions for rarely that I've seen before include "when hundred-to-one horse wins?" , "Very occasionally" , "very well" , "Seldom, not frequently" , "Hardly ever, most infrequently" .)