Again seeking demand (7)
I believe the answer is:
request
'demand' is the definition.
(I've seen this before)
'again seeking' is the wordplay.
'again' becomes 're'.
'seeking' becomes 'quest' ('quest' can be a synonym of 'seeking').
're'+'quest'='REQUEST'
(Other definitions for request that I've seen before include "Call for" , "Ask for" , "Polite demand" , "Plea" , "Application" .)