Found river north of sea (6)
I believe the answer is:
deemed
'found' is the definition.
The definition and answer can be both related to thinking as well as being past participle verbs.
Maybe there's an association between them I don't understand?
'river north of sea' is the wordplay.
'river' becomes 'dee' (River Dee).
'north of' says to put letters next to each other (in a down clue, some letters go above others).
'sea' becomes 'med' (short for Mediterranean).
'dee'+'med'='DEEMED'
Can you help me to learn more?
(Other definitions for deemed that I've seen before include "Considered, reckoned" , "Considered, held the view" , "Regarded, considered" , "Judged, thought, considered" , "Considered, opined" .)