Look for piano in a school (6)
I believe the answer is:
aspect
'look' is the definition.
(I know that look can be written as aspect)
'piano in a school' is the wordplay.
'piano' becomes 'p' (musical abbreviation).
'in' means one lot of letters goes inside another.
'school' becomes 'sect' (I've seen this in other clues).
'a'+'sect'='asect'
'p' inserted inside 'asect' is 'ASPECT'.
'for' is the link.
(Other definitions for aspect that I've seen before include "Viewpoint or view" , "Scene, look" , "View, panorama" , "front" , "Feature; appearance" .)