Views truculent behaviour by son (9)
I believe the answer is:
attitudes
'views' is the definition.
The answer and definition can be both acts as well as being plural nouns.
Maybe you can see a link between them that I don't see?
'truculent behaviour by son' is the wordplay.
'truculent behaviour' becomes 'attitude' (I've seen this before).
'by' says to put letters next to each other.
'son' becomes 's' (genealogical abbreviation for son).
'attitude'+'s'='ATTITUDES'
Can you help me to learn more?
(Other definitions for attitudes that I've seen before include "Mental positions" , "Postures or viewpoints" , "Positions, stances" , "Ways of thinking or feeling" , "with antagonistic manner" .)