Give an account of explosion (6)
I believe the answer is:
report
I believe this clue is a double definition.
'give an account' is the first definition.
(I've seen this before)
'explosion' is the second definition.
(I've seen this before)
'of' acts as a link.
(Other definitions for report that I've seen before include "Declaration" , "Explosion" , "A loud bang, or an account" , "'Description, account (6)'" , "Written account" .)