E-W vul, at IMPs, you hold as south: ♠Q542 ♥AK107 ♦4 ♣J1076

W      N       E       S

-        -        -        1♣

1♦      3♣¹    Dbl²   ?

¹ 5+ clubs, 5-9 HCPs

² Responsive, usually 8+ HCPs and support for unbid suits.

What do you bid?