Blacklegs providing taxis at the transport centre (5)
I believe the answer is:
scabs
'blacklegs' is the definition.
('scab' can be a synonym of 'blackleg')
'taxis at the transport centre' is the wordplay.
'taxis' becomes 'cabs' ('cab' can be a synonym of 'taxi').
'at' says to put letters next to each other (I've seen this in other clues).
'the transport centre' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cabs' after 's' is 'SCABS'.
'providing' is the link.
Can you help me to learn more?
(Other definitions for scabs that I've seen before include "They continue to work" , "Wound crusts" , "Blacklegs, strikebreakers" .)