Cases of aide heading for Egypt wearing shades (8)
I believe the answer is:
patients
'cases' is the definition.
(I know this)
'aide heading for egypt wearing shades' is the wordplay.
'aide' becomes 'pa' (abbreviation for personal assistant).
'heading for' indicates taking the first letters.
'wearing' means one lot of letters goes inside another.
'shades' becomes 'tints' ('tint' can be a synonym of 'shade').
The initial letter of 'egypt' is 'e'.
'e' placed within 'tints' is 'tients'.
'pa'+'tients'='PATIENTS'
'of' acts as a link.
(Other definitions for patients that I've seen before include "cases" , "Those in a ward, perhaps" , "People who require medical care" , "They receive medical care" , "A doctor's clients" .)