Old lady more harsh about a pirate (8)
I believe the answer is:
marauder
'pirate' is the definition.
(thesaurus)
'old lady more harsh about a' is the wordplay.
'old lady' becomes 'ma' (both can informally mean mother).
'more harsh' becomes 'ruder' (I can't justify this - if you can you should believe this answer much more).
'about' is an insertion indicator.
'ruder' enclosing 'a' is 'rauder'.
'ma'+'rauder'='MARAUDER'
Can you help me to learn more?
(Other definitions for marauder that I've seen before include "person in search of prey and plunder" , "Roving robber" , "Raider" , "One wandering in search of prey or loot" , "'One runs wild, plundering and pillaging (8)'" .)