Gave solemn evidence that a quarrel arose in the south-east (5)
I believe the answer is:
swore
'gave solemn evidence' is the definition.
The answer and definition can be both to do with communicating as well as being past participle verbs.
Perhaps you can see a link between them that I can't see?
'a quarrel arose in the south-east' is the wordplay.
'a quarrel' becomes 'row' (synonyms).
'arose' is a reversal indicator (I've seen 'arising' mean this).
'in the' indicates putting letters inside.
'south east' becomes 'SE' (abbreviation).
'row' in reverse letter order is 'wor'.
'wor' put within 'se' is 'SWORE'.
'that' acts as a link.
Can you help me to learn more?
(Other definitions for swore that I've seen before include "Uttered profanities or avowed" , "Took oath or cursed" , "Blasphemed" , "used bad language" .)