Gran sits out for Leo, say (4,4)
I believe the answer is:
star sign
'leo say' is the definition.
(I know that Leo is a star sign)
'gran sits out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'gran'+'sits'='gransits'
'gransits' is an anagram of 'STAR SIGN'.
'for' is the link.
(Other definitions for star sign that I've seen before include "Leo perhaps" , "Virgin, for example" , "Cancer or Capricorn, say" , "Eg, Taurus" , "Astrological house" .)