I got the "playfair codeword" from 36a wine which in the grid is I?CO
There are only 3 letters for the blank which work in the decoder that pkd gave. Use "playfair breaker with wine and i?co" using a then b then cetc for your missing letter.....doesn't take long to get the 3 that actually work. If you get the 3 choices I am sure you will deduce which one is correct.
Ask again if you are stuck/ if i have confused you more!!