Which engine makes a couple caress? (3-6)
I believe the answer is:
two-stroke
'which engine' is the definition.
I can't judge whether this definition defines the answer.
'a couple caress?' is the wordplay.
'a couple' becomes 'two' (two people or things).
'caress?' becomes 'stroke' ('stroke' can be a synonym of 'caress').
'two'+'stroke'='TWO-STROKE'
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for two-stroke that I've seen before include "Small combustion engine" , "Engine for eg motor mower" , "Type of internal-combustion engine" .)