Implore second European to cut tree (7)
I believe the answer is:
beseech
'implore' is the definition.
(I've seen this before)
'second european to cut tree' is the wordplay.
'second' becomes 's' (common abbreviation).
'european' becomes 'e' (abbreviation e.g. EU).
'to cut' indicates putting letters inside (some letters cut their way into a word).
'tree' becomes 'beech' (beech is a kind of tree).
's'+'e'='se'
'se' inserted inside 'beech' is 'BESEECH'.
(Other definitions for beseech that I've seen before include "Beg earnestly, implore" , "Fervently ask (someone) for something" , "request, urgently" , "Sue" , "pray" .)