Look at fire rising over explosive device (7)
I believe the answer is:
examine
'look at' is the definition.
(synonyms)
'fire rising over explosive device' is the wordplay.
'fire' becomes 'axe' (I've seen this before).
'rising' shows that the letters should be reversed in order (going up in a down clue).
'over' is a charade indicator (letters next to each other).
'explosive device' becomes 'mine' (mine is a kind of explosive device).
'axe' in reverse letter order is 'exa'.
'exa'+'mine'='EXAMINE'
(Other definitions for examine that I've seen before include "Inspect, peruse closely" , "Inspect carefully" , "Test, probe" , "Look closely at < test" , "vet" .)