Attractive forests are finally encountering axes (4)
I believe the answer is:
sexy
'attractive' is the definition.
(I've seen this before)
'forests are finally encountering axes' is the wordplay.
'finally' indicates one should take the final letters.
'encountering' says to put letters next to each other.
'axes' becomes 'xy' (x axis and y axis).
The final letters of 'forests are' are 'se'.
'se'+'xy'='SEXY'
(Other definitions for sexy that I've seen before include "arousing passion" , "Erotic" , "Titillating" , "Exciting, attractive" , "Seductive" .)