Treble shape of steep roof (4-7)
I believe the answer is:
high-pitched
'treble shape' is the definition.
'high pitched' can be an answer for 'treble' (thesaurus). I'm not certain of the 'shape' bit.
'steep roof' is the wordplay.
'steep' becomes 'high' (similar in meaning).
'roof' becomes 'pitched' (I am not sure about this - if you are sure you should believe this answer much more).
'high'+'pitched'='HIGH-PITCHED'
'of' is the link.
Can you help me to learn more?
(Other definitions for high-pitched that I've seen before include "Whistling" , "typical of Peruvian football?" , "(Of a roof) steep" .)