Correct signs (5)
I believe the answer is:
ticks
'correct signs' is the definition.
'ticks' can be an answer for 'signs' (I have seen 'Signs of approval ' mean 'ticks' so perhaps 'signs' could also mean 'ticks'). I'm unsure of the 'correct' bit.
'correct signs' is the wordplay.
'correct' becomes 'tick' (a tick is used to mark an answer correct).
'signs' becomes 's' (this could be a standard abbreviation I've not previously seen).
'tick'+'s'='TICKS'
Can you help me to learn more?
(Other definitions for ticks that I've seen before include "Makes noise like old clock" , "covers" , "Mites in mattress" , "Marks right" , "Bloodsuckers; seconds" .)