Full range, power within cult strange (8)
I believe the answer is:
spectrum
'full range' is the definition.
'spectrum' can be an answer for 'range' (a spectrum is a range or variety). I'm not sure about the 'full' bit.
'power within cult strange' is the wordplay.
'power' becomes 'p' (symbol in physics).
'within' indicates putting letters inside.
'cult' becomes 'sect' (religious sect).
'strange' becomes 'rum' (similar in meaning).
'p' placed inside 'sect' is 'spect'.
'spect'+'rum'='SPECTRUM'
Can you help me to learn more?
(Other definitions for spectrum that I've seen before include "Wide range" , "Array, range" , "range of tones" , "lot of colours" , "An entire range of related qualities of crumpets" .)