Guardian Genius 79

[Scotsdi]

First time doing this and stuck!

18a Packaging raunchy snaps in scientists study P?O?I?S
19a No briefer instruction to solver: look above and below T?R????
25d Rich Texans manor houses, in part? E?I?G?

Would appreciate explanation too as some of them I have it beats me why!

Thanks

[turnerjmw]

18a PHOTICS. Snaps = PICS packaging i.e. surrounding raunchy = HOT. It's a scientific field

[jno]

Ewings

[Scotsdi]

Thank you thank you...really appreciate it!

[turnerjmw]

19a TERSEST. Means no briefer. Answer above is ANAGRAM, below is SETTERS. And that's what it is

[jno]

should have explained (though you probably got it): E(ast) wings - part of manor house

[Scotsdi]

Thanks to everyone, I do a lot of other cryptic crosswords and it takes time to get into the mind of the setter!