Poet right to change line, for balance (9)
I believe the answer is:
tightrope
'line for balance' is the definition.
'tightrope' can be an answer for 'line' (I have seen 'Entertaining line' mean 'tightrope' so perhaps 'line' could also mean 'tightrope'). I'm unsure of the 'for balance' bit.
'poet right to change' is the wordplay.
'to change' indicates anagramming the letters.
'poet'+'right'='poetright'
'poetright' is an anagram of 'TIGHTROPE'.
Can you help me to learn more?
(Other definitions for tightrope that I've seen before include "An acrobat walks on this high above the ground" , "- - -walker" , "High wire" , "Balancing act wire" , "On which acrobats walk" .)