Ranges of skills going up after mushroom is consumed (7)
I believe the answer is:
spectra
'ranges' is the definition.
(spectrum is a kind of range)
'skills going up after mushroom is consumed' is the wordplay.
'skills' becomes 'arts' (I've seen this before).
'going up' is a reversal indicator.
'after mushroom' becomes 'pec' (I am not sure about this - if you are sure you should believe this answer much more).
'is consumed' means one lot of letters goes inside another.
'arts' backwards is 'stra'.
'stra' placed around 'pec' is 'SPECTRA'.
'of' acts as a link.
(Other definitions for spectra that I've seen before include "Whole ranges" , "Bands of coloured light" , "rainbows seen" , "Carpets (anag.)" , "Ranges of light wavelengths" .)