Toughen up rock idols if going to Glastonbury at last (8)
I believe the answer is:
solidify
'toughen up' is the definition.
I can't judge whether this definition defines the answer.
'rock idols if going to glastonbury at last' is the wordplay.
'rock' is an anagram indicator (the solver must 'rock' the letters around).
'going to' says to put letters next to each other.
'at last' suggests the final letters.
The last letter of 'glastonbury' is 'y'.
'idols' is an anagram of 'solid'.
'solid'+'if'+'y'='SOLIDIFY'
Can you help me to learn more?
(Other definitions for solidify that I've seen before include "Become hard" , "Cake" , "Harden" .)