I seem to have exhausted all possibilities for 28A and 29D and the best I can come up with is BARP and PAVE respectively, but any help in parsing both clues would be greatly appreciated
Still not sure how 29a works:
Quarry group of workmen approach from below PA?E).
Pave (as in pavement) could be quarry-tile group, and approach could be ave(nue), but where does the P or workmen come in?