Small hand of a timekeeper (6)
I believe the answer is:
minute
This clue could be a double definition.
'small' is the first definition.
(similar in meaning)
'hand of a timekeeper' is the second definition.
'minute' can be an answer for 'hand' (minute hand is a kind of hand). I am unsure of the 'of a timekeeper' bit.
Can you help me to learn more?
(Other definitions for minute that I've seen before include "Little -- 60 18 across" , "Tiny; period of time" , "Measure of time" , "Sixty seconds" , "Small amount of time" .)