Big mistake keeping spectacles on head in energetic dance (6)
I believe the answer is:
boogie
'dance' is the definition.
(I know that boogie is a more specific form of the action dance)
'big mistake keeping spectacles on head in energetic' is the wordplay.
'mistake' indicates anagramming the letters.
'keeping' indicates putting letters inside.
'spectacles' becomes 'oo' (OO resembles a pair of glasses).
'on' is a charade indicator (letters next to each other).
'head in' says to take the initial letters.
The initial letter of 'energetic' is 'e'.
'big' with letters rearranged gives 'bgi'.
'bgi' enclosing 'oo' is 'boogi'.
'boogi'+'e'='BOOGIE'
(Other definitions for boogie that I've seen before include "Rock'n'roll dance" , "Dance (to pop music)" , "Dance to jazz music" , "Piano blues style" .)