Scoring: MP
The auction goes:
2♣* - pass - 3♣* - pass
pass - ...
(2♣ shows 10-13, unbalanced, 5+♣)
(3♣ is a constructive raise)
Now LHO asks for an undo, which you obviously deny.
The auction continues:
2♣* - pass - 3♣* - pass
pass - Dbl - pass - 3♥
???
Your turn
EDIT: "no, something else" must be "yes, something else"