Sharp increase (4)
'sharp increase' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for spike that I've seen before include "ear" , "Large nail; lace (drink)" , "Sharp point, nail" , "Decide not to run" , "Sharp point; flower cluster" .)
'sharp increase' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for hike that I've seen before include "Walking tour" , "Go walking with equipment" , "Travel by Shank's Mare" , "Long, hard walk" , "(Go for) a long walk" .)