Office worker English consider mild in character (9)
I believe the answer is:
temperate
'office worker english consider mild in character' is the definition.
I can't tell whether this definition defines the answer.
'office worker english consider' is the wordplay.
'office worker' becomes 'temp' (temporary worker in an office).
'english' becomes 'E' (abbreviation as in OED).
'consider' becomes 'rate' (I've seen this before).
'temp'+'e'+'rate'='TEMPERATE'
Can you help me to learn more?
(Other definitions for temperate that I've seen before include "With mild climate" , "sober" , "Showing moderation" , "Moderate, mild" , "It is reasonable" .)