[geofspa]

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RHO opened 1NT (15-17) LHO transfered and then invited in ♥, at which point my partner overcalled 3NT. I called 4♣ which is where we are playing.

I can see 20 HCP between my hand and dummy, and the contract depends upon pulling this suit in for one loser.

My first thought is to lead the King ... but am I correct ?

[Echognome]

Lead the K or small to the K, that is fine. Noting that you have 10 clubs between the hands and that RHO opened 1NT, I wouldn't be surprised to see lefty show out when we lead towards dummy. Doesn't seem to be much of a suit combination, unless you think righty psyched.

[skjaeran]

If you really have 10 cards in the two hands; start with ♣ towards the king or the king from dummy (due to which hand's got the lead). You'll always pick up AJx with RHO (the 1NT opener).

If you have only 9 cards; start with a low towards dummy, in case LHO has singleton ace. If nothing happened, play opener for AJx - that's best odds from what we now of the hands. (At the table more information present might twist the odds.)