US suing man out of hand and that's not at all pretentious (10)
I believe the answer is:
unassuming
'hand and that's not at all pretentious' is the definition.
I can't judge whether this definition defines the answer.
'us suing man out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'us'+'suing'+'man'='ussuingman'
'ussuingman' with letters rearranged gives 'UNASSUMING'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for unassuming that I've seen before include "Not pretentious" , "Modest" , "disrobing?" , "not taking things for granted" .)