Futility of free spinet lessons? (13)
I believe the answer is:
pointlessness
'futility' is the definition.
(I've seen this before)
'free spinet lessons?' is the wordplay.
'free' is an anagram indicator.
'spinet'+'lessons'='spinetlessons'
'spinetlessons' with letters rearranged gives 'POINTLESSNESS'.
'of' acts as a link.
(Other definitions for pointlessness that I've seen before include "Futility" , "that is demonstrated by blunt type" .)