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But what if partner gives a wrong explanation, corrects himself, and it is obvious to me that declarer missed the explanation? Can I draw declarer's attention to partner's correction?
In case you want to know more details:
I lead ♦T against NT, declarer asks about my honour lead, and partner explains our suit lead agreements instead (0/2 higher). Instead we play Rusinow - T promises the J. Declarer starts thinking while partner and dummy are chatting and joking about other things, and during the joking conversation partner says "It promises the jack!", while declarer keeps thinking - it was obvious to me at the time that she had missed it.
No hard feelings involved, just wondering. (I did not draw declarer's attention to the correction, declarer misguessed diamonds later and asked for a score correction - partner and I both agreed director should assume misexplanation.)
Note to moderators: please don't move this to the Laws forum.