Girl out with men shows mischievous spirit (7)
I believe the answer is:
gremlin
'mischievous spirit' is the definition.
(I've seen this before)
'girl out with men' is the wordplay.
'out with' indicates an anagram (out can mean wrong or inaccurate).
'girl' anagrammed with 'men' can make 'GREMLIN'.
'shows' acts as a link.
(Other definitions for gremlin that I've seen before include "Troublemaker (in the machinery?)" , "Imp causing mechanical problems?" , "Unexplained technical problem or fault" , "Bug (in engine)" , "Imagined mischievous spirit" .)