Woods giving warning by second tee (6)
I believe the answer is:
forest
'woods' is the definition.
('forest' can be a synonym of 'woods')
'warning by second tee' is the wordplay.
'warning' becomes 'fore' (I've seen this in other clues).
'by' says to put letters next to each other.
'second' becomes 's' (common abbreviation).
'tee' becomes 't'.
'fore'+'s'+'t'='FOREST'
'giving' is the link.
(Other definitions for forest that I've seen before include "Large densely wooded area" , "Land covered with trees" , "Area thick with trees" , "Best Actor Oscar winner 2006, for 'The Last King of Scotland'" , "Grow more rigid" .)