Upset originating from daughter going round marsh (6)
I believe the answer is:
offend
'upset' is the definition.
(offend can mean to upset or insult)
'originating from daughter going round marsh' is the wordplay.
'originating from' becomes 'of' (this might be a standard abbreviation of which I'm unaware).
'daughter' becomes 'd' (genealogical abbreviation).
'going round' is an insertion indicator (some letters go around others).
'marsh' becomes 'fen' (synonyms).
'of'+'d'='ofd'
'ofd' enclosing 'fen' is 'OFFEND'.
Can you help me to learn more?
(Other definitions for offend that I've seen before include "Commit an illegal act" , "Distress" , "Commit crime - hurt feelings" , "Aggrieve" , "Cause displeasure to, bruise feelings" .)