Creator of law for police that keeps one on the beat? (9)
I believe the answer is:
pacemaker
'creator of law for police that' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'keeps one on the beat?' is the wordplay.
'keeps one' becomes 'maker' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on' means one lot of letters go next to another.
'the beat?' becomes 'pace' (beat is a kind of pace).
'maker' after 'pace' is 'PACEMAKER'.
Can you help me to learn more?
(Other definitions for pacemaker that I've seen before include "leader at the start" , "Implanted device to control the heartbeat" , "Device correcting heart rhythms" , "the first in race" , "Device to regulate the heartbeat" .)