Kind of glue covering bottom of label (7)
I believe the answer is:
clement
'kind' is the definition.
(I've seen this before)
'glue covering bottom of label' is the wordplay.
'glue' becomes 'cement' (I've seen this before).
'covering' is an insertion indicator.
'bottom of label' becomes 'l' (I can't justify this - if you can you should believe this answer much more).
'cement' enclosing 'l' is 'CLEMENT'.
'of' acts as a link.
(Other definitions for clement that I've seen before include "- - Attlee (PM)" , "Several popes" , "mercy" , "not heavy" , "Mild or balmy" .)