Seated in decorous fashion (6)
I believe the answer is:
sedate
'decorous fashion' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how one could define the other.
'seated' is the wordplay.
'seated' can be anagrammed to 'SEDATE'.
Though, I am not clear how this is indicated.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for sedate that I've seen before include "Calm, not flighty" , "not disturbed by passion or excitement?" , "Calm, sober" , "grave" , "Calm; put to sleep" .)