Very good point about bustles (2-3)
I believe the answer is:
to-dos
'bustles' is the definition.
Although both the answer and definition are plural nouns, I can't see how one could define the other.
'very good point about' is the wordplay.
'very good' becomes 'so' (as in the adjectival form 'just so!').
'point' becomes 'dot' ('dot' can be a synonym of 'point'**).
'about' is a reversal indicator.
'so'+'dot'='sodot'
'sodot' backwards is 'TO-DOS'.
Can you help me to learn more?
(Another definition for to-dos that I've seen is " Commotions".)