General deliveries a couple of Liberals assembled (7)
I believe the answer is:
overall
'general' is the definition.
(similar in meaning)
'deliveries a couple of liberals assembled' is the wordplay.
'deliveries' becomes 'over' (I've seen this before).
'couple of' shows that letters should be duplicated.
'liberals assembled' becomes 'l' (I can't explain this - if you can you should give a lot more credence to this answer).
'l' doubled is 'll'.
'over'+'a'+'ll'='OVERALL'
Can you help me to learn more?
(Other definitions for overall that I've seen before include "it protects clothes" , "Protective coat painters put on" , "All round" , "Dress for dirty work" , "On the whole - protective garment" .)