Organising tea or writing poetry you need her (5)
I believe the answer is:
erato
'writing poetry you need her' is the definition.
(Greek muse of poetry)
'organising tea or' is the wordplay.
'organising' indicates anagramming the letters.
'tea'+'or'='teaor'
'teaor' anagrammed gives 'ERATO'.
(Other definitions for erato that I've seen before include "Who may have inspired poetry" , "daughter of Zeus" , "Lyric poetry's muse" , "One inspiring" , "Muse of 11 and 23" .)