Pool worker one goes in to look up in Times (6)
I believe the answer is:
typist
'pool worker' is the definition.
(someone working in a secretarial pool)
I can't explain the rest of the clue.
(Other definitions for typist that I've seen before include "Key worker" , "Old secretary" , "Someone paid to copy using a keyboard" , "Stenographer" , "Worker taken from pool, perhaps" .)