Press and why it doesn't usually mean what it says (5)
I believe the answer is:
irony
'it doesn't usually mean what it says' is the definition.
The definition suggests a singular noun which matches the answer.
'press and why' is the wordplay.
'press' becomes 'iron' (ironing is a kind of pressing).
'and' means one lot of letters go next to another.
'why' becomes 'y'.
'iron'+'y'='IRONY'
Can you help me to learn more?
(Other definitions for irony that I've seen before include "sarcastic wit" , "Socratic method of discussion" , "Caustic remark" , "Satire, sarcasm" , "Mockery" .)