[inquiry]

Perhaps the 6♠ should have warned your partner off of bidding the grand slam, because if the 4♣ cue showed the king, partner would have bid 6♣ with the king of clubs (or 6♥ with the king of hearts) plus the spade queen (and 7♠ with both kings and the spade queen).

The opening lead was the ♠Ten

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Spoiler

Trumps are 3-1

[Flameous]

Seems like we should start winning hand, ♥A, heart ruff, ♣A, club ruff, heart ruff high

Now we are down to

A
-
AKQx
Qx

Q98
x
xxx
-

Now we have two lines, cash a spade, take a club ruff. My squeeze prospects seem quite good and if ♣K came down in three rounds I'm already home.
Another possibility is of course taking two more ruffs but then you need trumps breaking which seems worse.

I'm not sure if you could safely fit some extra chances of J singleton or doubleton in diamonds if you abandon full cross ruff from the start.

[ahydra]

I like flameous' first line. Nothing else really looks good (even the dummy reversal in clubs only works if diamonds are 3-3).

ahydra