Entering the lumberjack’s trade (7)
I believe the answer is:
logging
This clue is a double definition.
'entering' is the first definition.
(logging is a kind of entering)
'lumberjack's trade' is the second definition.
(I've seen this in another clue)
'the' acts as a link.
(Other definitions for logging that I've seen before include "Cutting wood" , "Felling of trees" , "working in forest" .)