Lovatts Colossus 159 Giant Cryptic

Hi puzzlers I need some help

1a. Lee has somewhere to stay. = (7). No letters
4a. Could have power. =.(5) No letters
7a. Elly admits red convertible is rather old. (7) No letters
11a. Hound graduate to produce doctrine. =.(5) ( I could only think of URGED but basically no clue)
15a. To retaliate, stop work support. =. (6,4) No letters
16a. Curiously boat dealer went into greater detail (10). .??B???????
22a. Teenager keeps badger . (3).( Maybe. NAG)

1d. Dodges transport, despite going on board (9) second last letter is probably P
2d Live wire served up average beer (5,6). = ??????EAV??
3d. ungratefully, Hanks let Sly get into trouble (11). .?????E?S??
4d. Room built by two hundred with love of Casablanca setting (7). Last letter may be an O
5d. Midnight before boy is happy (4). No letters
6d. Conflict ends and firearms become toys. (7). Last letter may be an S
8d. I dress Sting in fashion that's worrying (11) =??S???S?ING
9d. Conservative about raincoat designed by Henry Fifth (11) =. (Maybe REACTIONARY
10d. Surrendering profit in Greek capital (8). .?E????G
12d. Bright and extremely vivacious celebrant (7). ????A?T

Hope someone can help

Cheers
Smithy