Fair quite rowdy by lake in Lincoln? (9)
I believe the answer is:
equitable
'fair' is the definition.
('equitable' can be a synonym of 'fair')
'quite rowdy by lake in lincoln?' is the wordplay.
'rowdy' indicates an anagram.
'by' says to put letters next to each other.
'lake' becomes 'l'.
'in' is an insertion indicator.
'lincoln?' becomes 'abe'.
'l' put within 'abe' is 'able'.
'quite' anagrammed gives 'equit'.
'equit'+'able'='EQUITABLE'
(Other definitions for equitable that I've seen before include "Even-handed" , "Fair to all parties" , "Fair, impartial" .)