In friendly spirit, claim bay for redevelopment (8)
I believe the answer is:
amicably
'in friendly spirit' is the definition.
(in an amicable or friendly way)
'claim bay for redevelopment' is the wordplay.
'for redevelopment' indicates anagramming the letters (I've seen this in other clues).
'claim'+'bay'='claimbay'
'claimbay' anagrammed gives 'AMICABLY'.
(Other definitions for amicably that I've seen before include "not fighting?" , "In a friendly fashion" , "In a friendly manner" .)