Nincompoop grabbing second dance (5)
I believe the answer is:
twist
'dance' is the definition.
(twisting is a kind of dancing)
'nincompoop grabbing second' is the wordplay.
'nincompoop' becomes 'twit' (I've seen this before).
'grabbing' indicates putting letters inside.
'second' becomes 's' (common abbreviation).
'twit' placed around 's' is 'TWIST'.
(Other definitions for twist that I've seen before include "Dance - unexpected turn" , "tobacco to chew?" , "Change - 1960s' dance" , "another card, please" , "Rotate rapidly" .)