Minor interruption in service permitted (3)
I believe the answer is:
let
This clue is a triple definition!
'minor interruption' is the first definition.
'let' can be an answer for 'interruption' (thesaurus). I am not certain of the 'minor' bit.
'in' acts as a link.
'service' is the second definition.
(type of tennis serve)
'permitted' is the third definition.
(to let something happen is to permit it)
Can you help me to learn more?
(Other definitions for let that I've seen before include "Won't stop you" , "inefficient service" , "Allow, don't hinder" , "Allow the obstruction" , "Allow; tennis fault" .)