Ordered to start to talk back? Fair enough! (4)
I believe the answer is:
okay
'fair enough' is the definition.
'okay' can be an answer for 'fair' (thesaurus). I'm not sure about the 'enough' bit.
'ordered to start to talk back?' is the wordplay.
'to start to' indicates taking the first letters.
'talk' becomes 'yak' (yak is a kind of talk**).
'back?' says the letters should be written in reverse (I've seen 'back' mean this).
The initial letter of 'ordered' is 'o'.
'yak' reversed gives 'kay'.
'o'+'kay'='OKAY'
Can you help me to learn more?
(Other definitions for okay that I've seen before include "Not terrific but acceptable" , "Satisfactory; permissible" , "Fine" , "Fairly good; approve" , "Approve, endorse" .)