Obvious uproar at callers being abused (7-5)
I believe the answer is:
crystal-clear
'obvious' is the definition.
(I've seen this before)
'uproar at callers being abused' is the wordplay.
'uproar' becomes 'cry' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'being abused' is an anagram indicator.
'at'+'callers'='atcallers'
'atcallers' with letters rearranged gives 'stalclear'.
'cry'+'stalclear'='CRYSTAL-CLEAR'
Can you help me to learn more?
(Other definitions for crystal-clear that I've seen before include "Pellucid" , "Completely transparent" , "Completely unclouded" , "Easy to understand" , "In need of no further explanation" .)