Get ground floor flat after application (5,5)
I believe the answer is:
entry level
'application' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'get ground floor flat' is the wordplay.
'get' says to put letters next to each other.
'ground floor' becomes 'entry' (I can't explain this - if you can you should give a lot more credence to this answer).
'flat' becomes 'level' (synonyms).
'entry'+'level' is 'ENTRY-LEVEL'.
'after' acts as a link.
(Other definitions for entry level that I've seen before include "Simple" , "suitable for beginner" , "In basic terms" , "for beginners?" .)