Slowing down to let monarch out (3)
I believe the answer is:
bar
'slowing down' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Perhaps there's a link between them I don't understand?
'let monarch out' is the wordplay.
I cannot quite see how this works, but
'monarch' could be 'r' (abbreviation for rex, king in Latin) and 'r' is found within the answer.
The remaining letters 'ba' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
'to' is the link.
Can you help me to learn more?
(Other definitions for bar that I've seen before include "Except - lawyers" , "shoal at mouth of river" , "Length of wood or metal - drinking place" , "Save; pub" , "Support (for a drinker?)" .)