Appropriate header concealed from user adopting online search? (9)
I believe the answer is:
sequester
'appropriate' is the definition.
(thesaurus)
'header concealed from user adopting online search?' is the wordplay.
'header concealed from' means to remove the first letter.
'adopting' is an insertion indicator.
'online' becomes 'e' (as in e-mail or e-commerce).
'search?' becomes 'quest' (quest is a kind of search).
'user' with its initial letter taken off is 'ser'.
'e'+'quest'='equest'
'ser' going around 'equest' is 'SEQUESTER'.
(Other definitions for sequester that I've seen before include "Isolate or hide away (something or someone)" , "Take aside" , "Appropriate" , "Set aside" , "Legally confiscate" .)