Replanted fir trees in Spanish headland (10)
I believe the answer is:
finisterre
'spanish headland' is the definition.
The definition suggests a singular noun which matches the answer.
'replanted fir trees in' is the wordplay.
'replanted' indicates an anagram (letters get placed or planted in new positions).
'fir'+'trees'+'in'='firtreesin'
'firtreesin' with letters rearranged gives 'FINISTERRE'.
Can you help me to learn more?
(Another definition for finisterre that I've seen is " Spanish cape; shipping forecast area now renamed FitzRoy".)