20 down
Half
of
African
country
welcomes
retiring
setter’s
large
source
of
games?
(7)
Half of African country welcomes retiring setter’s large source of games? (7)
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The definition is at the end of the clue.
How the clue works
Source of games is the definition (the Olympics). Take "half of African country" by using OPIA from ethiOPIA, then have it welcome MY (the setter's) plus L (large) reversed — "retiring" tells you to flip MYL into LYM. Slotting LYM inside O···PIA gives OLYMPIA.