Thought blue team a different colour (10)
I believe the answer is:
considered
'thought' is the definition.
(considering is a kind of thinking)
'blue team a different colour' is the wordplay.
'blue' becomes 'con' (both can mean a Conservative).
'team' becomes 'side' (both can mean a sports team).
'a different colour' becomes 'red' (red is a kind of colour. I am not sure about the 'different' bit.).
'con'+'side'+'red'='CONSIDERED'
Can you help me to learn more?
(Other definitions for considered that I've seen before include "Looked at" , "Deliberated" , "Thought carefully about" , "Believed to be" , "respected" .)