Supply lines to actor on time (6)
I believe the answer is:
prompt
This clue could be a double definition.
'supply lines' is the first definition.
(I've seen this before)
'on time' is the second definition.
(synonyms)
'to actor' acts as a link.
I am not very happy about this link. Some or all of it may belong to one of the definitions.
Can you help me to learn more?
(Other definitions for prompt that I've seen before include "With little or no delay" , "Quick - cue" , "Bring about; actors' help" , "effective in expedition" , "Urge - done without delay" .)