1♣/1♢ – (1♡) – x

1♣/1♦ – (1♥) – x

N
W   E
 
S
♠ Q 10 8 5
♥ A 4 2
♦ 10 6 5 2
♣ K 9 8

Dealer:

West

W N E S
1♣ 1♥ Double

When opponents bid 1♥ over opener's 1♣ or 1♦, a double shows exactly 4 cards in spades and 6+ points.

It doesn't show the other minor.

With 5+ spades we bid 1♠. We leverage the overcall to be more precise about our spade length.