May want nothing, HRH, surprisingly (8)
I believe the answer is:
hawthorn
'may' is the definition.
(may is another name for the hawthorn tree)
'want nothing hrh surprisingly' is the wordplay.
'nothing' becomes 'O' (O resembles 0).
'surprisingly' is an anagram indicator (a surprising ordering of the letters).
'want'+'o'+'hrh'='wantohrh'
'wantohrh' anagrammed gives 'HAWTHORN'.
(Other definitions for hawthorn that I've seen before include "Small spring-blooming tree" , "Hedgerow bush" , "Hedge tree" , "fruit supplier" , "May tree" .)