Sudden increase in power, in second, on drive (5)
I believe the answer is:
surge
'sudden increase in power' is the definition.
(I've seen this before)
'in second on drive' is the wordplay.
'in second' becomes 's' (common abbreviation. I am not sure about the 'in' bit.).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'drive' becomes 'urge' (I've seen this in another clue).
's'+'urge'='SURGE'
Can you help me to learn more?
(Other definitions for surge that I've seen before include "crest of a wave" , "Suddenly increase" , "Jerk" , "Rolling swell of the sea" , "Sudden flow" .)