[david_c]

You're in 4♠ on the uncontested auction 1♦ - 1♠ - 1NT - 4♠.

    ♠ A9
    ♥ J972
    ♦ AJ976
    ♣ J4

    ♠ QT7632
    ♥ AT
    ♦ 53
    ♣ AQ6

Yes, partner's hand is a normal opening bid. You can blame me for that one

Anyway, the lead is the ♣7. Plan the play.

Not wanting to pre-empt your decision at trick one (if there is one), I have some hidden text for you -
If you play the ♣J:

Spoiler

RHO plays the K

If you play the ♣4:

Spoiler

RHO plays the 9

[pclayton]

I'll start with the J♣ (assume it gets covered) and try a ♦to the 9. Assuming something bad happens like it loses to the 10, I'll with the return (say a club) and ruff a club. A♠ and heart to the Ace and I'm at the crossroads, having to play for Kx or Jx.

If the 9♦ pushes out an honor, I'll win the return and take another diamond hook. Assume it wins, I'm in real good shape. There's a few variations, but I'll try the A♦ now. it probably gets ruffed, and I'll play A♣, ruff a club, ruff the 4th diamond, spade to Ace and the 5th diamond ditching a heart.

I don't think we have the entries to play for some kind of nice friendly heart position and keep the rest of our options open.

[Kalvan14]

Quite a good line of play. I don't see anything better

[Fluffy]

neither do I