Istriwallah a strong personality (4,3)
I believe the answer is:
iron man
'strong personality' is the definition.
The definition suggests a singular noun which matches the answer.
'istriwallah a' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is found within the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for iron man that I've seen before include "Comic hero played on screen by Robert Downey, Jr" , "fellow of great strength" , "Tough event" , "Endurance competition" , "one of great strength" .)