Jane's going out in trousers (5)
I believe the answer is:
jeans
'trousers' is the definition.
(denim trousers)
'jane's going out' is the wordplay.
'going out' indicates anagramming the letters (out can mean wrong or inaccurate).
'janes' anagrammed gives 'JEANS'.
'in' is the link.
(Other definitions for jeans that I've seen before include "article of clothing" , "Denim trousers" , "boys in France?" , "Trousers made of strong cotton, usually dyed blue" , "Are they worn by girls in Britian" .)