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I found today's xword very difficult!
One answer I cannot parse; the other I cannot even do!

15A: Queen is unable to enter a fair number of chains for trading(10)
The answer is 'mercantile' = trading (definition)
'er' - Queen
cant - unable
which leaves 'mile' but cannot parse this bit?

19A: Expected to import new science fiction blockbuster(4)
?U?E
due - expected
N - new
so possibly 'dune' but if so, why?

Help needed, please!

mile is 80 chains

https://en.wikipedia.org/wiki/Dune_(film)

Thank you, Jazzgirl - I didn't know that .
I looked up 'mile' in my Chambers - didn't see that definition? -
I guess I'd better look again!

Thanks Mamya - No wonder I couldn't get that one!!!!
All finished now.

It's not in my Chambers, Elle. I shoule have said
there are 80 chains in a mile

Well, at least I'm not inept at looking up a definition anyway!