Help on filling in the blanks gratefully accepted!
Across
1 Genuinely reduced increase for William (3)
21 Arab probing for a source of edible rootstock (4) _ ar _
27 Centrepiece is removed from green hub (5) _ a _ ve
49 Edmund's country wife missing from Hebridean town lane (3) _ nd
Down
1 Money taken away from mean unpaid worker (4) _ s _ e
8 Sullen local bits making passes in East London (6) PO _ R _ S
23 Winged insect is evidently dropping dead crossing France (8)
_ _ a _ efly (CRANEFLY? but cannot parse)