Totally cool to have a couple of lines? (2,3)
I believe the answer is:
in all
'totally' is the definition.
(I've seen this before)
'cool to have a couple of lines?' is the wordplay.
'cool' becomes 'in' (I've seen this in other clues).
'to have' means one lot of letters go next to another.
'a couple of lines?' becomes 'all' (I can't explain this - if you can you should believe this answer much more).
'in'+'all'='IN ALL'
Can you help me to learn more?
(Other definitions for in all that I've seen before include "Taken as a whole" , "without exception" , "totally" , "In total" , "Completely" .)