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There are 100 clues with the answer 'BOOSTER'
# CLUE
1.
A dose of an immunising substance given to maintain or renew the effect of a previous one (7)
2.
Supplementary immunizer
3.
Third shot, for many
4.
Heckles the Maori king getting a second shot (7)
5.
Getting some boos, Terence? You need the third Covid jab (7)
6.
Third Covid jab
7.
Source of added protection
8.
Bores to prepare for reinforcing injection (7)
9.
Enhancer to augment our defence against our common enemy (7)
10.
Disapprove of plant denying a second jab (7)
11.
Supplementary injection (7)
12.
Additional dose of vaccine, ... shot
13.
Thruster of a rocket
14.
Additional dose of vaccine (7)
15.
A supplementary injection of a vaccine given to maintain the immunisation provided by an earlier dose (7)
16.
Auxiliary motor in a rocket (7)
17.
Organise an upgrade, with little hesitation, for one's sponsor (7)
18.
Needle, jeer and mock the rest (7)
19.
Rocket motor needs another injection (7)
20.
Rocket first stage
21.
Follow-up shot
22.
I don't approve of this rest treatment as a provider of energy (7)
23.
Rocket part made by South African with East German investment
24.
Additional dose that makes sure the first was effective (7)
25.
A device for increasing electrical power or voltage
26.
Rocket's first stage
27.
Rocket stage; vaccine
28.
Supplementary vaccine dose
29.
Space rocket's first stage
30.
Reinforcing vaccine's first stage