I suggest you bid 3 ♠ ... Your partner might not understand what that bid mean but he/she will know that it is forcing to game If your partner bid 3 NT - you raise to 6. If your partner bid 4 ♣ , it must be slammy, since 3 ♠ is GF. You cue 4 ♥ and you will reach 6 ♣ If your partner bid 5 ♣ he has probably minimum points 8-10 and a long but not solid suit (which you already know since you hold the Ace.) So you raise to 6 ♣ And btw next time, your should open 2 NT...