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1 Across, It's not so easy to grasp incomplete 27 and 3 (7)
(27 = Stone that's old and familiar (4) 3= Odd energy-saving new mill using stones (5) )

5 Across,Old fellows reach summit in low season (3-4)

11 Across, Corrupt union pinched equipment and nearly all stock (10)

12 Across, Stone sailors loaded into bottom of boat (6)

Compiler - RADIAN

Many Thanks

5 Off Peak.

12a: ke RN el

11a: unoriginal= stock (def)
anagram of union, rig al (l)

27 opal
3 quern (a stone mill)

1 a opa(L) quer(n)

Good afternoon and many thanks to you all.

You are welcome, John!
Hope all is well with you?