Jamaican sprinter in bar (4)
I believe the answer is:
bolt
This clue could be a double definition.
'jamaican sprinter' is the first definition.
'Bolt' can be an answer for 'sprinter' (runner Usain Bolt). I am not sure about the 'jamaican' bit.
'bar' is the second definition.
(I know that bolt is a type of bar)
'in' acts as a link.
Can you help me to learn more?
(Other definitions for bolt that I've seen before include "Run away; bar of lock" , "Fasten - flee" , "From the blue, it's a great surprise" , "Run away suddenly; long fixing pin" , "Latch" .)