I've completed the grid and the extra words are (unless I'm mistaken)"Join country's letters showing flag shape". And that's where I'm lost. I've tried joining the letters in COUNTRY and I see there are a lot of double O's, if that's significant.
I've learnt elsewhere that you are supposed to make out the flag of Nepal. However, I can't see it at all and neither can I see that country's letters: either NEPAL or NP.
The N is at the intersection of 16ac and 4dn, and the P at the interection of 25ac and 5dn. There should be only one of each of those letters in your grid
Thank you, keepatit. But all that gives me is a short diagonal line. I know what the flag of Nepal looks like but if that really is the end of the crossword then it's quite an anticlimax!