Finally grasping English, if nothing else (2,5)
I believe the answer is:
at least
'if nothing else' is the definition.
(I've seen this before)
'finally grasping english' is the wordplay.
'finally' becomes 'atlast' ('at last' can be a synonym of 'finally').
'grasping' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'atlast' going around 'e' is 'AT LEAST'.
(Other definitions for at least that I've seen before include "'If nothing else (2,5)'" , "Anyway" , "Eat salt (anag) - if nothing else" , "As a minimum" , "however" .)