Not so hot when skirt’s lifted (3)
I believe the answer is:
meh
'not so hot' is the definition.
(I've seen this in another clue)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for meh that I've seen before include "am I bovvered?" , "expression of indifference" , "Not much cop" , "Who cares" , "Unexciting (modern slang)" .)