Ringing area in on-screen shot (9)
I believe the answer is:
resonance
'ringing' is the definition.
(I know that ringing can be written as resonance)
'area in on-screen shot' is the wordplay.
'area' becomes 'a' (maths abbreviation).
'in' is an insertion indicator.
'shot' indicates an anagram.
'on'+'screen'='onscreen'
'onscreen' with letters rearranged gives 'resonnce'.
'a' inserted within 'resonnce' is 'RESONANCE'.
(Other definitions for resonance that I've seen before include "Sound amplification" , "continuation of noise" , "Plangency" , "shaking" , "Deep, clear, ringing quality" .)