Trick woman into breaking up a group of stars (13)
I believe the answer is:
constellation
'a group of stars' is the definition.
(I've seen this before)
'trick woman into breaking up' is the wordplay.
'trick' becomes 'con' (I've seen this before).
'woman' becomes 'stella' (**).
'breaking up' indicates an anagram.
'into' with letters rearranged gives 'tion'.
'con'+'stella'+'tion'='CONSTELLATION'
(Other definitions for constellation that I've seen before include "Twins, perhaps" , "Twenty-five across for instance" , "Draco, perhaps" , "Star group" , "Client to salon (anag.)" .)