The Gunners fixing a day where young players train (4)
I believe the answer is:
rada
'young players train' is the definition.
The definition suggests a singular noun which matches the answer.
'the gunners fixing a day' is the wordplay.
'the gunners' becomes 'RA' (Royal Artillery).
'fixing' indicates putting letters inside (inserted letters are fixed inside others).
'day' becomes 'd' (abbreviation for day).
'a'+'d'='ad'
'ra' placed around 'ad' is 'RADA'.
'where' is the link.
Can you help me to learn more?
(Other definitions for rada that I've seen before include "acting establishment" , "Famous acting academy" , "Theatre school" , "Acting school" .)