The French girl outside brings fever (7)
I believe the answer is:
malaria
'fever' is the definition.
(I've seen this before)
'the french girl outside' is the wordplay.
'the french' becomes 'la' ('the' in French).
'girl' becomes 'maria' ().
'outside' indicates putting letters inside.
'la' going within 'maria' is 'MALARIA'.
'brings' acts as a link.
(Other definitions for malaria that I've seen before include "Disease from a mosquito bite" , "Fever-inducing disease" , "Illness" , "Tropical fever" , "Infectious fever" .)