Sack errand boy who gets sick (7)
I believe the answer is:
pillage
'sack' is the definition.
(I've seen this in another clue)
'errand boy who gets sick' is the wordplay.
I cannot really see how this works, but
'sick' could be 'ill' (similar in meaning) and 'ill' is found within the answer.
'boy' could be 'page' (a young male servant) and 'page' is found within 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 pillage that I've seen before include "Rob with violence" , "Loot" , "Violent stealing" , "Sacking" , "Plunder, sack" .)