It ensures a good reception for some speakers (6)
I believe the answer is:
aerial
'it ensures' is the definition.
The definition suggests a singular noun which matches the answer.
'a good reception for some speakers' is the wordplay.
'good reception' becomes 'ial' (I can't explain this - if you can you should give a lot more credence to this answer).
'for' says to put letters next to each other (I've seen this in other clues).
'some' says to take the centre.
'speakers' becomes 'utterers' (I've seen this in another clue).
The middle letters of 'utterers' are 'er'.
'ial' put after 'er' is 'erial'.
'a'+'erial'='AERIAL'
Can you help me to learn more?
(Other definitions for aerial that I've seen before include "What may receive" , "It receives radio and TV signals" , "Rod for receiving radio waves" , "It picks up radio waves" , "Signal receiver" .)