Label in new seed bed (8)
I believe the answer is:
Here is my best explanation:
'label' is the definition.
'in new seed bed' is the subsidiary indication.
'in' indicates putting letters inside.
'new' indicates anagramming the letters.
'bed' becomes 'crib' (I've seen this in other clues).
'seed' is an anagram of 'dese'.
'dese' placed around 'crib' is 'describe'.
(Other definitions for describe that I've seen before include "Illustrate", "Report in detail", "Give an account of in words", "Paint in words", "Represent in words", "Portray - narrate", "Say what something is like (8)", "Tell what something is like", "Draw (a geometrical figure)" and "Give detailed account of".)