Queen's favourite new hair gel (7)
I believe the answer is:
raleigh
'queen's favourite' is the definition.
(I've seen this before)
'new hair gel' is the wordplay.
'new' indicates anagramming the letters.
'hair'+'gel'='hairgel'
'hairgel' is an anagram of 'RALEIGH'.
(Other definitions for raleigh that I've seen before include "Did he fetch tobacco" , "Sir Walter --, courtier" , "SECOND PART OF 12 ACROSS" , "English explorer" , "Elizabethan explorer" .)