6 Across, Riddles involved with road and hen -this kind?, (5,6,3)
15 & 17 Across, Vegetables and source of water used by enviromentalists, (6,6)
1 Down,Scarcity of accomodation in the ship, (8)
18 Down, It sounds like single officer could be a perfect partner,(8)
Sorry about the lack of letters,trying to get a start