7d : Philatelic specimen shown by someone in a rented shop in London?(2,6)I have S-/T-N---
I have lots more to do, but think I have gorn wrong with 18d and would appreciate help :Screw up the hinge that's loose (8)Can't think past 'tighten' but that's not enough letters and I have -E-G-T-N. Any help appreciated