High in an attic (5)
I believe the answer is:
aloft
'high' is the definition.
(I've seen this in another clue)
'an attic' is the wordplay.
'an' becomes 'a'.
'attic' becomes 'loft' (synonyms).
'a'+'loft'='ALOFT'
'in' is the link.
(Other definitions for aloft that I've seen before include "Up in the sky" , "at high altitude" , "as 1 ac [PEGASUS] was?" , "In the rigging, up high" , "flying?" .)