Secure though not all together (3)
I believe the answer is:
get
'secure' is the definition.
(secure can mean to get or obtain)
'not all together' is the wordplay.
'not all' indicates the answer is hidden within the clue (only some of the letters).
'GET' is hidden in the letters of 'together'.
'though' is the link.
(Other definitions for get that I've seen before include "Escape" , "Receive; obtain" , "Fetch or obtain" , "See 18" , "Procure from vegetables" .)