Secure as possible at the back of a cafe (4)
I believe the answer is:
safe
'secure' is the definition.
(I know this)
'possible at the back of a cafe' is the wordplay.
'possible' becomes 'sa' (I am not sure about this - if you are sure you should believe this answer much more).
'at the back' indicates one should take the final letters.
The final letters of 'of cafe' are 'fe'.
'sa'+'fe'='SAFE'
'as' acts as a link.
Can you help me to learn more?
(Other definitions for safe that I've seen before include "Metal box for storing valuables in" , "Protected from danger" , "Secure cupboard" , "Secure and protected" , "Unharmed" .)