Paper on strike cutting the supply (9)
I believe the answer is:
telegraph
'paper' is the definition.
(I've seen this before)
'on strike cutting the supply' is the wordplay.
I cannot really see how this works, but
'on' could be 'leg' (cricket term, fielding positions) and 'leg' is present in the answer.
'strike' could be 'rap' (synonyms) and 'rap' is found within the answer.
an anagram of 'the' is 'teh' which is present in the remaining letters.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for telegraph that I've seen before include "Means of communication" , "Messaging system" , "Device for transmitting information over distance" , "Transmission (by wire on poles)" , "A scoreboard" .)