Leaves out the R in "divers" (7)
I believe the answer is:
several
'divers' is the definition.
(I've seen this before)
'leaves out the r in' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'in' is an insertion indicator.
'leaves' anagrammed gives 'seveal'.
'seveal' placed around 'r' is 'SEVERAL'.
(Other definitions for several that I've seen before include "A good few" , "A few; separate" , "Divers" , "More than one or two" , "Reveals (anag.)" .)