Key article delayed getting rocket (8)
I believe the answer is:
escalate
'rocket' is the definition.
(I've seen this before)
'key article delayed getting' is the wordplay.
'key' becomes 'esc' ('Escape' key on a computer keyboard).
'article' becomes 'a' (indefinite article).
'delayed' becomes 'late' (I've seen this before).
'getting' means one lot of letters go next to another.
'esc'+'a'+'late'='ESCALATE'
(Other definitions for escalate that I've seen before include "Ramp up" , "Tease Cal badly and mount up" , "Increase in magnitude" , "Raise to higher level, perhaps war" , "Cause to increase, say dispute (8)." .)