Label in new seed bed (8)
I believe the answer is:
describe
'label' is the definition.
(thesaurus)
'in new seed bed' is the wordplay.
'in' indicates putting letters inside.
'new' indicates an anagram.
'bed' becomes 'crib' (I've seen this before**).
'seed' anagrammed gives 'dese'.
'dese' enclosing 'crib' is 'DESCRIBE'.
(Other definitions for describe that I've seen before include "Portray in words" , "Paint in words" , "Draw (figure); give account of" , "Provide image" , "style" .)