Irreligious young lad with no answer needing to be reformed (7)
I believe the answer is:
ungodly
'irreligious' is the definition.
('ungodly' can be similar in meaning to 'irreligious')
'young lad with no answer needing to be reformed' is the wordplay.
'with no' indicates named letters should be taken away.
'answer' becomes 'a' (abbreviation eg in Q and A).
'needing to be reformed' is an anagram indicator.
'young'+'lad'='younglad'
'younglad' with 'a' taken out is 'youngld'.
'youngld' anagrammed gives 'UNGODLY'.
(Other definitions for ungodly that I've seen before include "Irreligious, immoral" , "Characterised by iniquity" , "Outrageous; sinful" , "being so early?" , "Ugly Don being irreligious" .)