Guardian 26,579

[anikomo]

Would greatly appreciate help with final clues.
12a. This regularly cuts Iron Duke's rank.(5) I have F?T??
4d. At sea, rig stern brace.(8) I have ?T?I?G?R
8d. Compilers the boss exploited.(4) I have ?S?? Maybe USED?

[scorpiojo]

Fetid - Fe t(h)i(s)d
Stringer anag
Us (compilers) ed

[scorpiojo]

^ d = duke

[dannyk13]

12a.Fetid
4d.Stringer
8d.Used

[Captain2]

4d Stringer (brace on a staircase)

[scorpiojo]

stringer (ˈstrɪŋə)
n
1. (Architecture) architect
a. a long horizontal beam that is used for structural purposes
b. another name for stringboard
2. (Nautical Terms) nautical a longitudinal structural brace for strengthening the hull of a vessel

[anikomo]

Very many thanks to you all.

[Captain2]

Jo I know it, from my quantity surveying days, as the timbers on the open 'side' of a staircase

[scorpiojo]

Sorry Captain, you weren't there when I googled