Examined sphere's even colour (6)
I believe the answer is:
peered
'examined' is the definition.
The definition and answer can be both to do with perception as well as being past participle verbs.
Maybe there's an association between them I don't understand?
'sphere's even colour' is the wordplay.
'even' means one should take alternating letters (letters in even-numbered positions are used).
'colour' becomes 'red' (red is a kind of colour).
The alternating letters of 'spheres' are 'pee'.
'pee'+'red'='PEERED'
Can you help me to learn more?
(Other definitions for peered that I've seen before include "Having been made a Lord < examined" , "Look searchingly" , "Looked through narrowed eyes" , "Looked closely" , "Looked searchingly" .)