Evergreen tree European bishop planted in battle site (9)

I believe the answer is:

naseberry

'evergreen tree' is the definition.

'european bishop planted in battle site' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'bishop' becomes 'rr' (abbreviation for Right Reverend).
'planted in' is an insertion indicator.
'battle site' becomes 'naseby' (site of the Battle of Naseby).
'e'+'rr'='err'
'err' going within 'naseby' is 'NASEBERRY'.

(Another definition for naseberry that I've seen is " Tree".)

I've seen this clue in The Times.

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