1 Small youth leader upset with unknown fuel consumption
4 Trace endless flicker
9 Trim so that French sect's easily upset
10 Italian all disapprove twice in initial employment
11 Prosecute deer? I hear it's a sham
12 After amending bad drug Act, I stand down
14 Going back into turbulent English river near whirlpool
16 Fix spark-maker's wing
17 I do it stupidly for a fool
19 Broadcaster's weight between two queens
21 I postpone worshipper
22 Digestive vim takes it back to many
25 Flat out aloft without force
26 Hun come in fighting a mongoose
27 Trade evidence shows disappointing turnover
28 Reef fish together

Down

1 Paper's tacit slip alters parts of speech
2 Mesh state with end of trigger
3 Beginning period period
4 Climb time after time in the end
5 Native's fashionable garb on hill-dweller
6 More run down rubbish layer
7 Lead oxide stirred many, being slow-moving
8 This conveys food, but without barges!
13 Control currency in executive style
15 Leader cut nothing on twisted track
18 Relaunched as great weepie
20 Don't consume as much - one wouldn't if it was like this!
23 Speed breaks pot, holding me up
24 Deliver time with it