Musical group have a broad extent of energy to deal with a situation (9)
I believe the answer is:
bandwidth
'energy to deal with a situation' is the definition.
I can't judge whether this defines the answer.
'musical group have a broad extent' is the wordplay.
'musical group' becomes 'band' (band is a kind of musical group).
'have' is a charade indicator (letters next to each other).
'a broad extent' becomes 'width' (I have seen 'Lateral extent' mean 'width' so perhaps 'extent' could also mean 'width'. I am not sure about the 'broad' bit.).
'band'+'width'='BANDWIDTH'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for bandwidth that I've seen before include "Range of transmission frequencies" , "Informal capacity" , "Particular range of frequencies" .)