Any help would be appreciated with the following clues please.
4D: Two-county town A?H?O?E (7)
17D: America's military nemesis in the 1970's ?I?T ?O?? (4-4)
29A: Torch hangar spoiling historical site in 28A ?A?H?R???A? (11) (answer to 28A is Roscommon)
Thanks in advance