After recent arrival, gas of any kind cut (8)
I believe the answer is:
neonatal
'after recent arrival' is the definition.
(after a recent birth)
'gas of any kind cut' is the wordplay.
'gas' becomes 'neon' (I've seen this before).
'of any kind' becomes 'atall' (eg 'no food at all' means 'no food of any kind').
'cut' means to remove the last letter.
'atall' with its final letter taken off is 'atal'.
'neon'+'atal'='NEONATAL'
(Other definitions for neonatal that I've seen before include "of newborn babies!" , "Describing newly-born" , "at a very young age" , "Relating to the newborn" , "Like clinic" .)