Woman to have food sent up (4)
I believe the answer is:
enid
'woman' is the definition.
'food sent up' is the wordplay.
'food' becomes 'E' (E is an example).
'sent up' becomes 'nid' (I am not sure about this - if you are sure you should believe this answer much more).
'e'+'nid'='ENID'
'to have' acts as a link.
Can you help me to learn more?
(Other definitions for enid that I've seen before include "& 18 Down Children's author" , "Arthurian wife" , "Miss Blyton" , "- Blyton, twentith century writer" , "W - - Blyton" .)