Tabloid with dislike mostly for high-level protection (6)
I believe the answer is:
sunhat
'high-level protection' is the definition.
(protection on one's head ie at a high level)
'tabloid with dislike mostly' is the wordplay.
'tabloid' becomes 'sun' (The Sun, UK newspaper).
'with' means one lot of letters go next to another.
'dislike' becomes 'hate' (hating is a kind of disliking).
'mostly' means to remove the last letter.
'hate' with its last letter taken away is 'hat'.
'sun'+'hat'='SUNHAT'
'for' acts as a link.
(Other definitions for sunhat that I've seen before include "Summer head protector" , "Haunts (anag.)" , "Broad-brimmed summer titfer" , "Protective headgear" .)