Problem settled in Communications centre, no question (6)
I believe the answer is:
glitch
'problem' is the definition.
(a glitch is a problem or malfunction)
'settled in communications centre no question' is the wordplay.
'settled' becomes 'lit' (I've seen this in another clue).
'in' means one lot of letters goes inside another.
'communications centre' becomes 'GCHQ' (Government Communications Headquarters).
'no' suggests deleting specific letters.
'question' becomes 'q'.
'gchq' with 'q' taken away is 'gch'.
'lit' going into 'gch' is 'GLITCH'.
(Other definitions for glitch that I've seen before include "An informal malfunction" , "Unexpected setback" , "Sudden brief malfunction in electronic system" , "sudden hiccup" , "Malfunction or snag" .)