Overhead railroads initially from Chelsea's centre (3)
I believe the answer is:
els
'overhead railroads' is the definition.
(I've seen this in another clue)
'from chelsea's centre' is the wordplay.
'from' says the answer is hidden in the clue.
'ELS' can be found hidden inside 'chelseas centre'.
'initially' is the link.
I am not very happy about this link. It may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for els that I've seen before include "South African golfer" , "Successful owner of several clubs" , "Golfer; elevated railways" , "Ernie - - (golfer)" , "US urban railways" .)