Peninsula of African country with no western boundary (6)
I believe the answer is:
iberia
'peninsula' is the definition.
(Iberia is an example)
'african country with no western boundary' is the wordplay.
'african country' becomes 'liberia' (Liberia is an example).
'with no western boundary' means to remove the first letter (remove the left-hand edge or boundary of the word).
'liberia' with its initial letter taken off is 'IBERIA'.
'of' is the link.
(Other definitions for iberia that I've seen before include "European peninsula comprising Spain and Portugal" , "old part of Europe" , "Peninsula housing Spain and Portugal" , "West European peninsula" , "Old name for Spanish peninsula" .)