Contradictory advice about keeping cool? (4,4,5,2)
I believe the answer is:
keep your shirt on
'contradictory advice' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'about keeping cool?' is the wordplay.
I cannot really understand how this works, but
'about' could be 'on' (as in a book 'on' a certain topic) and 'on' is found within the answer.
'cool?' could be 'keep' (keeping cool is a kind of cooling) and 'keep' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for keep your shirt on that I've seen before include "Not topless please" , "Unlike a ruined gambler" , "remain cool" , "don't panic!" , "Chill out!" .)