Publication that can make a big blast (5)
I believe the answer is:
organ
'publication' is the definition.
(organ is a kind of publication)
'can make a big blast' is the wordplay.
I cannot really understand how this works, but
'a' could be 'an' and 'an' is found in the answer.
The remaining letters 'org' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'that' acts as a link.
Can you help me to learn more?
(Other definitions for organ that I've seen before include "means for communicating information" , "notes issue from this" , "Heart or lung, say" , "Perhaps one that's stopped" , "stops on one" .)