Overseer of pasture turning crimson (6)
I believe the answer is:
leader
'overseer' is the definition.
The answer and definition can be both people as well as being singular nouns.
Maybe there's an association between them I don't understand?
'pasture turning crimson' is the wordplay.
'pasture' becomes 'lea' (both can mean a field).
'turning' says the letters should be written backwards.
'crimson' becomes 'red' (synonyms).
'red' written backwards gives 'der'.
'lea'+'der'='LEADER'
'of' is the link.
Can you help me to learn more?
(Other definitions for leader that I've seen before include "Party head" , "Important (newspaper) article" , "One in command" , "Pioneer" , "important member of orchestra" .)