Very much recovered at last, after turning up gas (2,3)
I believe the answer is:
no end
'very much' is the definition.
('no end' can mean to a great degree)
'recovered at last after turning up gas' is the wordplay.
'at last' indicates one should take the final letters.
'after' says to put letters next to each other.
'turning up' shows that the letters should be reversed in order.
'gas' becomes 'neon' (neon is a gas).
The last letter of 'recovered' is 'd'.
'neon' in reverse letter order is 'noen'.
'd' put after 'noen' is 'NO END'.
(Other definitions for no end that I've seen before include "Very much (unfinished?)" , "Very much (slang)" , "what eternity offers?" , "detailed?" , "Without limit" .)