Manage poetry in Old English (7)
I believe the answer is:
oversee
'manage' is the definition.
(I know that manage can be written as oversee)
'poetry in old english' is the wordplay.
'poetry' becomes 'verse' (synonyms).
'in' means one lot of letters goes inside another.
'old english' becomes 'OE'.
'verse' placed within 'oe' is 'OVERSEE'.
(Other definitions for oversee that I've seen before include "Keep an eye on like foreman" , "take charge" , "Superintend, manage" , "Exercise supervision" , "Act as tutor" .)