Weird to dig up end of school yard (9)
I believe the answer is:
unearthly
'weird' is the definition.
(I've seen this before)
'dig up end of school yard' is the wordplay.
'dig up' becomes 'unearth' (I've seen this before).
'end of' indicates one should take the final letters.
'yard' becomes 'y'.
The last letter of 'school' is 'l'.
'unearth'+'l'+'y'='UNEARTHLY'
'to' is the link.
(Other definitions for unearthly that I've seen before include "Preposterous" , "Sunny" , "H G Wells's invaders appeared?" , "So unpleasantly early an hour" , "Not of this world, supernatural" .)