Performing with US rock group, also inside awaiting a hearing (2,6)
I believe the answer is:
on remand
'inside awaiting a hearing' is the definition.
(in prison awaiting a hearing)
'performing with us rock group' is the wordplay.
I cannot quite see how this works, but
'performing' could be 'on' (as in being on stage) and 'on' is located in the answer.
'with' could be 'and' and 'and' is located in the answer.
'rock group' could be 'rem' (REM are a US rock band) and 'rem' is located in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'also' acts as a link.
Can you help me to learn more?
(Other definitions for on remand that I've seen before include "Not yet tried" , "officially not out" , "Status of some prisoners" , "awaiting court's decision?" , "yet untried" .)