Oh dear, some weeks I do so well on this, but this is one of those other weeks.
I think I've got these two but am not sure.
10a Taking portside tack, gamble for ship (5)
Sloop? IE pools or gamble backwards, though that doesn't explain the 'taking portside tack' bit.
56a I regret snatching it back, a huge area of land (7)
Eurasia? I can see the I and Rue backwards and the final 'a' but that leaves an unexplained 'as' in the middle.