Walford man, seasick, wants nurse (9)
I believe the answer is:
eastender
'walford man seasick' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'wants nurse' is the wordplay.
'wants' becomes 'eas' (I can't explain this - if you can you should believe this answer much more).
'nurse' becomes 'tender' (I've seen this before).
'eas'+'tender'='EASTENDER'
Can you help me to learn more?
(Other definitions for eastender that I've seen before include "Butcher perhaps" , "Pearly Queen surely is" , "Someone born within the sound of Bow Bells?" , "Cockney" , "eg Barbara Windsor" .)