Get back about the rose at outset, that is very English! (8)
I believe the answer is:
retrieve
'get back' is the definition.
(get back can mean to retrieve or recover)
'about the rose at outset that is very english' is the wordplay.
'about' becomes 're' (common abbreviation for 'with reference to').
'at outset' indicates taking the first letters.
'that is' becomes 'i.e.' (short for Latin 'id est', 'that is').
'very' becomes 'v' (abbreviation).
'english' becomes 'e' (abbreviation).
The initial letters of 'the rose' is 'tr'.
're'+'tr'+'ie'+'v'+'e'='RETRIEVE'
(Other definitions for retrieve that I've seen before include "Revere it to get back" , "Recover" , "Get back or fetch" , "Go for and bring back" , "Find and bring back" .)