Assuming lives get fine with love (2,2)
I believe the answer is:
if so
'assuming' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'lives get fine with love' is the wordplay.
'lives' becomes 'is' ('be' can be a synonym of 'live').
'get' is an insertion indicator.
'fine' becomes 'f' (abbreviation).
'with' is a charade indicator (letters next to each other).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'is' enclosing 'f' is 'ifs'.
'ifs'+'o'='IF SO'
Can you help me to learn more?
(Other definitions for if so that I've seen before include "Should that happen?" , "Assuming that's true" , "In that case ..." .)