Advanced years of magistrate receiving cheers (6)
I believe the answer is:
dotage
'advanced years' is the definition.
'magistrate receiving cheers' is the wordplay.
'magistrate' becomes 'doge' (doge is a kind of magistrate).
'receiving' indicates putting letters inside.
'cheers' becomes 'ta' (I've seen this in other clues).
'doge' enclosing 'ta' is 'DOTAGE'.
'of' acts as a link.
(Other definitions for dotage that I've seen before include "Feeble later life" , "when any activity may become difficult?" , "In which one would be old and weak" , "Foolish later life" , "Senile years" .)