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?
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