Take off some Chinese tat I'm ironing when upset (7)
I believe the answer is:
imitate
'take off' is the definition.
(I've seen this before)
'some chinese tat i'm ironing when upset' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'when upset' says the letters should be written in reverse (in a down clue - set, written, up).
'etatimi' can be found hidden inside 'chinese tat im ironing'.
'etatimi' back-to-front is 'IMITATE'.
(Other definitions for imitate that I've seen before include "Parrot" , "Reproduce" , "Copy, simulate" , "Mock" , "Copy someone" .)