Concerned with recent delivery of gas the least bit short (8)
I believe the answer is:
neonatal
'concerned with recent delivery' is the definition.
The answer and definition are not the same part of speech. However, adjectives and past participle verbs occasionally define each other.
'gas the least bit short' is the wordplay.
'gas' becomes 'neon' (neon is a gas).
'the least bit' becomes 'at all' (synonyms).
'short' means to remove the last letter.
'atall' with its last letter removed is 'atal'.
'neon'+'atal'='NEONATAL'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for neonatal that I've seen before include "relating to babies" , "Recently delivered" , "Describing newly-born" , "at a very young age" , "Relating to newborns" .)