27a : Guide to Personnel to river (6)
I have ?E?E?R
But I fancy LEADER but that clashes with 15down's final 'E' ..
15d : Sit down, assume one's to have a meal (4,1,4) for which I have put TETE A TETE but I am not convinced.
15d with known letters is T?T? A ?E??
TIA
Z.