Stuck on these clues,any help would be appreciated. Thank you.
12 across-Gunners at front of fortification out of line- mathematical manoeuvre required(11) ?A????????
24 across- Use track to move item of camping equipment(8)????????
28 across- What was bad about rhetoric once in old scientist's domain(11)
E??????????
29 across- Rickety car put into action,inadequate and full of holes(9)
?R???????
4 down- Mad male,a knight who is one of two on the field(7)
9 down- Bull about a ton is violent old monster(12)?I??????????
15 down- Italian boat that's managed to get trapped inside gorge(8)B???A???
18 down- Gnarled tree giving brief advantage to king(7)???????
4d striker (who is one of two on the field)
sir (a knight)
cannot parse anything for remaining letters (trek), but this xword is above my capabillities. Hope this may be of some use to you.