Send up some weak lopsided dance (5)
I believe the answer is:
polka
'dance' is the definition.
(polka is a kind of dance)
'send up some weak lopsided' is the wordplay.
'send up' shows that the letters should be reversed in order.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'aklop' is hidden in the letters of 'weak lopsided'.
'aklop' in reverse letter order is 'POLKA'.
(Other definitions for polka that I've seen before include "Lively dance (but dotty?)" , "Dot may be associated with this" , "Lively dance, originally from Bohemia" , "Lively dance of Bohemian origin" , "Dance in fast time with three steps and a hop" .)