Office worker has spoken of time (8)
I believe the answer is:
temporal
'office worker has spoken of time' is the definition.
I can't tell whether this defines the answer.
'office worker has spoken' is the wordplay.
'office worker' becomes 'temp' (I've seen this in another clue).
'has' means one lot of letters go next to another.
'spoken' becomes 'oral' (similar in meaning).
'temp'+'oral'='TEMPORAL'
Can you help me to learn more?
(Other definitions for temporal that I've seen before include "Relating to time" , "Limited by time" , "Passing" , "on the Head's side?" , "Secular; of the temples" .)