Performers' way, developing roots, getting old (5,4)
I believe the answer is:
stage door
'performers' way' is the definition.
'stage door' can be an answer for 'way' (stage door is a kind of way). I'm not certain of the 'performers'' bit.
'developing roots getting old' is the wordplay.
'developing' is an anagram indicator (letters developed into a new form).
'getting' means one lot of letters goes inside another.
'old' becomes 'aged' (similar in meaning).
'roots' is an anagram of 'stoor'.
'stoor' placed around 'aged' is 'STAGE-DOOR'.
Can you help me to learn more?
(Other definitions for stage door that I've seen before include "cast out here?" , "Artist's entrance" , "Theatre rear entrance" , "Theatre back entrance" , "Service entrance to theatre" .)