Aug 1 isn’t especially for a saint (8)
I believe the answer is:
ignatius
'for a saint' is the definition.
(St Ignatius is a Catholic saint)
'aug 1 isn't especially' is the wordplay.
'1' becomes 'I' (Roman numeral).
'especially' indicates anagramming the letters.
'aug'+'i'+'isnt'='augiisnt'
'augiisnt' is an anagram of 'IGNATIUS'.
(Other definitions for ignatius that I've seen before include "A suiting (anag) - saint" , "Early saint" , "martyr" , "Saintly character" , "Man" .)